定语从句专项 晋

学习必备欢迎下载学习必备欢迎下载学习必备欢迎下载定语从句◆英语谚语欣赏

1.Hewhoknowsnothingbutpretendstoknoweverythingisindeedagood-for-nothing.

不懂装懂,一事无成

2.It'sthefirststepthatcosts.千里之行,始于足下

3.Hewhomakeshimselfasheepshallbeeatenbythewolf.甘当小绵羊,迟早要喂狼4.HewhodoesnotreachtheGreatWallisnotatrueman.不到长城非好汉

Ⅰ.概念:

(1)定语从句：在主从复合句中用作定语的从句叫定语从句。定语从句一般紧接在先行词(antecedent)后面。

(2)先行词：被定语从句修饰的成份。先行词可以为一个词,短语,或整个主句。

(3)关系词：引导定语从句的词叫关系词,分为关系代词和关系副词。

关系词的作用:

1)引导定语从句,连接主句和从句,相当于一个连词;

2)必在从句中作某个句子成份(可以做主语,宾语,表语,定语,状语)

常用的关系代词:that、which、who、whom、whose、as、but(文语,置于否定词之后=that/who…not…,"没有……不……",在从句中作主语,宾语)

常用的关系副词(在从句中只作状语):when、where、why

定语从句解题三步骤:

第一找出先行词;

第二看先行词在定语从句中的语法功能(做主语、宾语或状语);

第三选择合适的关系词。

Ⅱ.关系代词的基本用法:

●that:可指人或物;在定语从句中作主语,宾语,表语。(指人时,相当于who或whom;指物时,相当于which)(一般不用于非限制性定语从句;不可置于介词后作宾语)如:

Aletterthat/whichiswritteninpencilisdifficulttoread.(主语)

Doyouknowthegentlemanthat/whospokejustnow?

Youcantakeanything(that)youlike.(宾语)

Whatisthequestion(that/which)theyaretalkingabout?

Hereistheman(who/whom/that)youwanttosee.

She'snolongerthegirl(that)sheusedtobebefore.(表语)

Ourhometownisnolongertheone(that)itusedtobe.

=Ourhometownisnotthesameasitusedtobe.

=Ourhometownisdifferentfromwhatitusedtobe。

=Ourhometownisnotwhatitusedtobe.

●which:指物;在定语从句中作主语,宾语,表语,定语。如:

Thebookwhich/thatwasonthedeskwasboughtbymyfather.(主语)

Thebook(which/that)Iboughtyesterdayisveryinteresting.(宾语)

Thefactoryinwhichhisfatherworksisfarfromhere.

Hewasproud,whichhisbrotherneverwas.(表语)

Tomspentfouryearsincollege,duringwhichtimehelearnedFrench.(定语)

Hemaybelate,inwhichcaseweoughttowaitforhim.

●who,whom,whose:

who:主格,在从句中作主语,在口语或非正式用法中可作宾语;只可指人

whom:宾格,在从句中只作宾语;只可指人

whose:所有格,在从句中作定语,可指人也可指物。如：

Ilikethestudentswho/thatworkhard.(主语)

Allwhoheardthestorywereamazed.(代词如he,they,any,those,all,one等后多用who.)

Chaplin,forwhomlifehadoncebeenveryhard,wasasuccessasanactor.

(宾语)

He'samanfromwhomweshouldlearn.

=He'saman(whom/who/that)weshouldlearnfrom.

比较:Heisthestudentwhomyouthinktobeworthyofyourpraise.

Heisthestudentwhoyouthinkisworthpraising.

Achildwhoseparentsaredeadiscalledanorphan.(指人)

I'dlikearoomwhosewindowfacessouth.(指物)

=I'dlikearoomofwhichthewindowfacessouth.

=I'dlikearoomthewindowofwhichfacessouth.

ThereisateapotshapedlikeaChineseduck,outofwhosemouthteaissupposedtocome.

关系代词作介词宾语:

关系代词在定语从句中用作介词宾语时,介词可放于从句之首,也可放于从句之末.但以放于句首较为正式.(介词前置,必须注意不影响动词词组的含义。关系代词who和that用作介词宾语时,介词必须放在句末)。如：

Thisisthebookforwhichyouasked.

=Thisisthebook(that/which)youaskedfor.

DoyouknowthepersonwithwhomIshookhands?=Doyouknowtheperson(whom/who/that)Ishookhandswith?

Inthedarkstreet,therewasn'tasinglepersontowhomshecouldturnforhelp.

Isthisthefactorytowhichyoupaidavisitlastweek?

Isthisfactorytheonetowhichyoupaidavisitlastweek?

Thisisthegirlwhomtheyarelookingafter.(介词after与look构成固定词组,不可前置)

●as的用法:(as引导定语从句,在定语从句中作主语、宾语、表语)

①如为限制性的,多用于thesame…as;thesameas;such…as…;asmany/muchas;so…as等结构中。如:

Ihavethesamebookasyou(have).我有一本和你的一样的书。

Herattitudetohimwasquitethesameasithadalwaysbeen.(关系代词as和指示代词same连用,在从句中用作表语,先行词是thesame.)

---Whydidn'tyoumentionthatinfaceofthepolicejustnow?

---Ithoughtitwassuchaminordetailaswashardlyworthmentioning.

Wewillonlydiscusssuchproblemsashavesomethingtodowithourowninterests.

Don'tdosuchthingsasyouarenotsureabout.

Thereisnosuchplaceasyoudreamofinallthisworld.

比较:Iliveinthesamehousethatheusedtolivein.(同一个房子)

I'mwearingthesameshirtasyouworeyesterday.（相同的衬衣）

比较:Hereissobigastoneasnoonecanlift.(定语从句)

Hereissobigastonethatnoonecanliftit.(结果状语从句)

②如为非限制性的,多单独引导一个定语从句,这种定语从句可置于句首,句中或句尾,译为"正如,这一点"。(动词常为know,see,expect,pointout,etc.)如：

Asweallknow,smokingisharmfultoone'shealth.(as作宾语)

=Asisknowntoall,smokingisharmfultoone'shealth.(as作主语)

=It'sknowntoallthatsmokingisharmfultoone'shealth.

=Smokingisharmfultoone'shealth,asweallknow.(as作宾语)

=Smoking,asweallknow,isharmfultoone'health.

Hewasaforeigner,asIknewfromhisaccent.

(宾语,先行词是前面整个句子)几个常用结构：Asweknow/see/expect,Asisknown/isexpected,Asisoftenthecase,Asismentionedabove,III.几个易混淆的关系代词的比较:

●that&which:

在定语从句中,which和that在指代事物时,一般可以互换使用,但并非在任何情况下都是这样,下面几种情况宜用that,而不宜用which

①先行词为不定代词,all,much,something,everything,anything,nothing,none,theone等,如：

Weshoulddoallthatisusefultothepeople.Allthatcanbedonehasbeendone.

There'snothingthatcanbesaidaboutit.

Doyoumeantheonethatwasboughtyesterday?

②先行词被,all,much,any,few,little,no,just,theonly,thevery,oneof等词修饰时。如：

Theonlythingthatwecoulddowastowait.

That'stheverywordthatiswronglyused.

Youcantakeany(=whichever)seatthatisfree.

比较*Thisisoneofthebestnovelsthatwerepublishedlastyear.

*Thisistheonlyoneofthebestnovelsthatwaspublishedlastyear.

③先行词是序数词时或被序数词修饰时。如：

WhenwetalkaboutHangzhou,thefirstthatcomesintomindisWestLake.

ThisisthethirdfilmthatThelastplace(that)wevisitedwasthechemicalworks.

④先行词是最高级或被最高级修饰时。如：

Thisisthebestthatcanbedonenow.

Themostimportantthingthatshouldbedonerightnowishowtostophimfromgoingon.

⑤先行词既有人又有物,用which和who都不适合,这时宜用that.如:

Thewriterandhisnovelthatyouhavejusttalkedaboutisreallywellknown.

Theriderandhisbikethathadrunoveranoldwomanwereheldupbythepolice.

⑥被修饰词为数词时如：

YesterdayIcaughttwofishandputtheminabasinofwater.Nowyoucanseethetwothatarestillalive.

⑦如果有两个从句,其中一个关系代词已用which,另一个关系代词宜用that,以避免语言的单调或重复。如：

Edisonbuiltupafactorywhichproducedthingsthathadneverbeenseenbefore.

⑧由疑问词是who或which引导的疑问句,关系代词宜用that,以避免重复如：

Whichisthebookthatyoulikebest?

Whoisthemanthatisstandingatthegate?

⑨主句是Therebe结构,修饰其主语的定语从句宜用that作关系代词如:

1.Thereisstillaseatinthecornerthatisstillfree.

⑩被修饰成分为表语时,或者关系代词本身是定语从句的表语时,该关系代词宜用that如：

That'sagoodbookthatwillhelpyoualot.

Myhomevillageisnolongertheplace(that)itusedtobe.

定语从句中宜用which而不宜用that的情况:

①当关系代词的前面有介词时（介词前置+which）如：

Azooisaparkinwhichmanykindsofanimalsarekeptforexhibition.

IsthistheroominwhichMr.Whitelives?

②在非限制性定语从句中如：

Crusoe'sdog,whichwasnowveryold,becameillanddied.

MoreandmorepeoplearebeginningtolearnEnglish,whichisbecomingverypopularinourcountry.(which指代主句)

③在一个句子中有两个定语从句,其中一个定语从句的关系代词用了that,另一个宜用which.

LetmeshowyouthenovelthatIborrowedfromthelibrarywhichwasnewlyopentous.

AtthestationIboughtsomemagazinesthatmighthelpmetopassthetimeonthetrainandwhichIcouldpassontootherswhenIfinishedthem.

④当关系代词后面带有插入语时如：

1.Here'stheEnglishgrammarwhich,asIhavetoldyou,willhelpimproveyourEnglish.

⑤先行词本身是that,宜用which如：

What'sthatwhichsheislookingat?

⑥先行词是those+复数名词如：

Ashopshouldkeepastockofthosegoodswhichsellbest.

who和that指代人时,有些情况宜用who,而不宜用that

①先行词为anyone,anybody,those,all,one,ones,they,he,people时.如:

ThepersonIwanttolearnfromistheonewhostudieshardandworkswell.

Anyonewho(=Whoever)failedtocometothemeetingyesterdaymustgivehisreason.

Thosewhoarenotfitfortheirworkshouldleaveofficeatonce

Idon'tliketheones(=those)whotalkbig.

②在Therebe结构中,修饰主语的定语从句宜用关系代词who指代人.如:

Thereisagentlemanwhowantstoseeyou.

Thereareseveralstudentsinourclasswhoarestillnotsureabouttheuseofattributiveclauses.

③当先行词有较长的后置定语时.如:

ImetaforeignerintheparkyesterdayafternoonwhocouldspeakChineseverywell.

④一个句子中带有两个定语从句,其中一个定语从句的关系代词是that,另一个则宜用who,以免重复.如:Thestudentthatwaspraisedatyesterday'smeetingisthemonitorwhoisverymodestandworksveryhard.

●as&which:

as&which引导非限制性定语从句的区别:

①位置的不同:

which引导的定语从句只置于所限制的句子后;as位置较灵活,也就是说as可置于所限制的句子前面,插在句子中或放在句子后。如:

Hewaslateagain,whichmadehisteacherveryangry.

Jack,asyouknow,isanhonestman.或Jackisanhonestman,asyouknow.

或Asyouknow,Jackisanhonestman.

②先行词的不同:

as引导非限制性定语从句时,其先行词多为一个句子;

which引导非限制性定语从句时,其先行词可以是一个词,一个短语或一个句子(定语从句多表示否定的或者不太为人满意的内容)。如：

※Hewasproud,whichhisbrotherneverwas.

Shewasverypatienttowardsthechildren,whichherhusbandseldomwas.

Hewasproud,whichIdislikeverymuch.

※Heisanhonestman,asisknowntoall.

Hewasaforeigner,asIknowfromhisaccent.

③as一般译为"正如""就像","这一点"；which一般译为“这一点”

asweallknow;asyouknow;asisknowntoall;asyousee;aswecansee;ashasbeenexpected

IV.关系副词引导的定语从句:

●When指时间,在定语从句中作时间状语。其先行词是表时间的名词(如:time,hours,moment,day,week,month,year,occasion,etc.)

HecamelastnightwhenIwasout.

Wewillputoffthepicnicuntilnextweek,whentheweatherwouldbebetter.

注意:先行词为"时间名词",可用when引导定语从句,when在定语从句中作状语;还可以用which或that引导,which或that在从句中作主语或宾语。

比较:Istillrememberthedaywhen/onwhichmybrotherjoinedthearmy.(作状语)

Istillrememberthedays（which/that）wespenttogether.(作宾语)

Nextmonth,whenyouwillbeinyourhometown,isjustaroundthecorner.

Nextwinter（which/that）you'llspendinHarbin,I'msure,willbeexciting.

IshallneverforgetthedaywhenShenZhouⅤwaslaunched,whichhasagreateffectonmylife.

Thereareoccasionswhenjokingisnotproper.

●Where指地点,在定语从句中作地点状语。其先行词是表示地点的名词,如:place,school,factory,room,或者看做是抽象地点的situation,degree,pointetc.如：

ThisistheplacewhereIwasborn.

Iliveintheroomwhere/inwhichheusedtolive.

注意:先行词是"地点名词",定语从句可用where引导,在从句中作状语；还可用which或that引导,which/that在从句中作主语或宾语。

比较:※Thisisthefactorywhere/inwhichheworkedlastyear.(作状语)

Thetreatmentwillcontinueuntilthepatientreachesthepointwherehecanwalkcorrectlyandsafely.

Ithinkyouhavegottothepointwhereachangeisneeded,oryouwouldfail.

Governmentreports,legalpapersandmostbusinesslettersarethemainsituationswhereEnglishisused.

He'sgothimselfintoadangeroussituationwherehe'slikelytolosecontroloftheplane.

Thesmallmountainvillagewherewespentourholidaylastmonthliesinwhat/theplacewhichisnowpartofHubei.

※Thisisthepark（which/that）theyvisitedlastyear.(作宾语)

Nothavingbeentherebefore,hesimplyhadnoideaabouttheplace,whicheveryonesaysisworthvisiting.

●Why指原因,在定语从句中作原因状语。先行词为reason,可用forwhich指代，（美国口语中也有用that的）;当关系词在从句中作主语或宾语时,则用which或that引导。如:

Thereasonwhy/forwhich/(that)hedidn'tattendthemeetingwasthathewasill.

Idon'tbelievethereason(that/which)hegaveme.(作宾语)

Haveyouaskedhimthereasonthatmayexplainhissuccess?(作主语)

比较：※Hewaslate.That'sbecausehegotuplate.

Hegotuplate.That'swhyhewaslate.(表语从句)

Thereasonwhy/forwhichhewaslate

wasthathewasdelayedinthetrafficjam.

当先行词为way时,定语从句常用that,inwhich,（间或用how引导）,that常可以省略。

way后的定语从句的引导词不用时较多。但如果关系词在句中作主语或宾语时,则用which或that引导。如:

Thisistheway(that)

/inwhich

Idosuchthings.

比较:Pleasedotheexperimentintheway(that/which)Ihaveshownyou.V.介词+关系代词1）介词后面的关系代词不能省略。2）that前不能有介词。3）某些在从句中充当时间，地点或原因状语的"介词+关系代词"结构可以同关系副词when,where和why互换。如：ThisisthehouseinwhichIlivedtwoyearsago.ThisisthehousewhereIlivedtwoyearsago.Doyourememberthedayonwhichyoujoinedourclub?Doyourememberthedaywhenyoujoinedourclub?Thisisthereasonwhyhecamelate.Thisisthereasonforwhichhecamelate.当介词放在关系代词前面时，关系代词只能用which/whom即“介词+which/whom"且不能省略。但当介词位于末尾时可用that/which/who/whom.作介词的宾语，且可以省略。如：(1)Theschool(that/which)heoncestudiedinisveryfamous."that/which"可以省略=Theschoolinwhichheoncestudiedisveryfamous."which”不可省略(2)TomorrowIwillbringhereamagazine(that/which)youaskedfor.=TomorrowIwillbringhereamagazineforwhichyouasked.(3)We’llgotohearthefamoussinger(whom/that/who)wehaveoftentalkedabout.=We’llgotohearthefamoussingeraboutwhomwehaveoftentalked.注意：1.含有介词的动词短语一般不拆开使用，如：lookfor,lookafter,takecareof等Thisisthewatch（which/that）Iamlookingfor.(T)ThisisthewatchforwhichIamlooking.(F)2.若介词放在关系代词前，关系代词指人时用whom，不可用who或者that；指物时用which，不能用that；关系代词是所有格时用whose(1)Themanwithwhomyoutalkedismyfriend.(T)Themanwiththatyoutalkedismyfriend.(F)(2)TheplaneinwhichweflewtoCanadaisverycomfortable.(T)TheplaneinthatweflewintoCanadaisverycomfortable.(F)3.“介词+关系代词”前可有some,any,none,both,all,neither,most,each,few等代词、数词或者名词。(1)Helovedhisparentsdeeply,bothofwhomareverykindtohim.(2)Inthebaskettherearequitemanyapples,someofwhichhavegonebad.(3)Therearefortystudentsinourclassinall,mostofwhomarefrombigcities.(4)Theboat,thenameofwhichisTopsail,isfamous.(5)Iboughtmanybooksyesterday,threeofwhicharewrittenbyLuXun.

VI.限制性定语从句与非限制性定语从句:

1.形式上,非限制性定语从句往往用逗号隔开。

2.语法上,非限制性定语从句一般不用that，关系代词which,whom即使作宾语也不能省略。

3.语义上,限制性定语从句与先行词关系紧密,起限定作用,如果去掉了这个定语从句,整个句子就不完整或者会改变意思;而非限制性定语从句与先行词关系不是很紧密,对先行词起补充说明或描述的作用。

ThisisthebookIlikebest.

这就是我最喜欢的那本书。

Beijing,whichhasbeenChina'scapitalformorethan800years,isrichinculturalandhistoricrelics.北京是中国八百年之久的古都,它有着丰富的文化和历史遗产。

4.翻译时,限制性定语从句可译为一句(较短的一般译为"的"字结构);而非限制性定语从句可译为两句。(见上句翻译)

比较:

Hehasasister,whoisamusician.他有一个姐姐，她是音乐家。

Hehasasisterwhoisamusician.他有一个是音乐家的姐姐。

引导非限制性定语从句的关系代词,指人时用who,whom,whose,指物时用which,whose;关系副词when,where,why,etc.

1.Hestudiedhardatschoolwhenhewasyoung,whichleadstohissuccessinhislaterlife.

2.Tom'sfather,whoarrivedjustnow,isafamousscientist.

3.Theysetupaseparatestateoftheirown,wheretheywouldbefreetokeepNegroesasslaves.

填上适当的关系词并注意辨析：

1.

Iwillneverforgettheday__________Ifirstwenttoschool.

Iwillneverforgettheday

__________wespentinBeijing.

2.Thehouse__________wevisitedisbeingrepairednow.

Thehouse______Luxunoncelivedisbeingrepairednow.

3.Hefailedintheexam._______madehisparentsangry.

Hefailedintheexam,_______madehisparentsangry.

4.Hehastwosons.Bothof________areteachers.

Hehastwosons,bothof________areteachers.

5.

Doyoulikethebook

shespent$10?

Doyoulikethebook

shepaid$10?

Doyoulikethebook

shelearnedalot?

Doyoulikethebook

sheoftentalks?

Key:1.when/onwhich;which/that2.which/that;where/inwhich3.That/It;which4.them;whom5.onwhich;forwhich;fromwhich;aboutwhich定语从句专项练习1.Theplace_______interestedmemostwastheChildren'sPalace.

A.WhichB.whereC.whatD.inwhich

2.Doyouknowtheman_______?

A.whomIspokeB.towhospokeC.IspoketoD.thatIspoke

3.Thisisthehotel_______lastmonth.

A.whichtheystayedB.atthattheystayed

C.wheretheystayedatD.wheretheystayed

4.Doyouknowtheyear______theChineseCommunistPartywasfounded?

A.whichB.thatC.whenD.onwhich

5.Thatistheday______I'llneverforget.

A.whichB.onwhichC.inwhichD.when

6.Thefactory______we'llvisitnextweekisnotfarfromhere.

A.whereB.towhichC.whichD.inwhich

7.Greatchangeshavetakenplacesincetheninthefactory_______weareworking.

A.whereB.thatC.whichD.there

8.Thisisoneofthebestfilms_______.

A.thathavebeenshownthisyearB.thathaveshown

C.thathasbeenshownthisyearD.thatyoutalked

9.Canyoulendmethebook______theotherday?

A.aboutwhichyoutalkedB.whichyoutalked

C.aboutthatyoutalkedD.thatyoutalked

10.Thepen______heiswritingismine.

A.withwhichB.inwhichC.onwhichD.bywhich

11.Theyarrivedatafarmhouse,infrontof______satasmallboy.

A.whomB.whoC.whichD.that

12.Theengineer______myfatherworksisabout50yearsold.

A.towhomB.onwhomC.withwhichD.withwhom

13.Itthereanyoneinyourclass______familyisinthecountry?

A.whoB.who'sC.whichD.whose

14.I'minterestedin______youhavesaid.

A.allthatB.allwhatC.thatD.which

15.Iwanttousethesamedictionary______wasusedyesterday.

A.whichB.whoC.whatD.as

16.Heisn'tsuchaman______heusedtobe.

A.whoB.whomC.thatD.as

17.HeisgoodatEnglish,______weallknow.

A.thatB.asC.whomD.what

18.LiMing,______totheconcertenjoyeditverymuch.

A.IwentwithB.withwhomIwentC.withwhoIwentD.Iwentwithhim

19.Idon'tlike______asyouread.

A.thenovelsB.thesuchnovelsC.suchnovelsD.samenovels

20.Hetalkedalotaboutthingsandpersons________theyrememberedintheschool.

A.whichB.thatC.whomD.what

21.Theletterisfrommysister,______isworkinginBeijing.

A.whichB.thatC.whomD.who

22.Inourfactorythereare2,000workers,twothirdsof____arewomen.

A.themB.whichC.whomD.who

23.You'retheonlyperson______I'veevermet______coulddoit.

A.who;/B./;whomC.whom;/D./;who

24.Ilostabook,______Ican'tremembernow.

A.whosetitleB.itstitleC.thetitleofitD.thetitleofthat

25.LastsummerwevisitedtheWestLake,______Hangzhouisfamousintheworld.

A.forwhichB.forthatC.inwhichD.what

26.Ihaveboughtsuchawatch_______wasadvertisedonTV.

A.thatB.whichC.asD.it

27.Icanneverforgettheday_______weworkedtogetherandtheday______wespenttogether.

A.when;whichB.which;whenC.what;thatD.onwhich;when

28.Theway______helooksatproblemsiswrong.

A.whichB.whoseC.whatD./

29.Thisisthereason______hedidn'tcometothemeeting.

A.inwhichB.withwhichC.thatD.forwhich

30.Thismachine,______formanyyears,isstillworkingperfectly.

A.afterwhichIhavelookedB.whichIhavelookedafter

C.thatIhavelookedafterD.Ihavelookedafter

31.Thereason______hedidn'tcomewas______hewasill.

A.why;thatB.that;whyC.forthat;thatD.forwhich;what

32.Heisworkinghard,______willmakehimpassthefinalexam.

A.thatB.whichC.forwhichD.who

33.Thatisnottheway______Idoit.

A./B.whichC.forwhichD.withwhich

34.Ihavetwogrammars,______areofgreatuse.

A.allofwhichB.eitherofwhichC.bothofthatD.bothofwhich

35.Iwanttousethesametools_______usedinyourfactoryafewdaysago.

A.aswasB.whichwasC.aswereD.which

36.Myneighboursusedtogivemeahandintimeoftrouble,_______wasverykindofthem.

A.whoB.whichC.thatD.it

37.Thisisthemagazine_______Icopiedtheparagraph.

A.thatB.whichC.fromthatD.fromwhich

38.Heisnotsuchaman_______wouldleavehisworkhalfdone.

A.thatB.whichC.whoD.as

39.Youcandependonwhateverpromise_______hemakes.

A./B.whyC.whenD.whose

40.Smoking,_______isabadhabit,is,however,popular.

A.thatB.whichC.itD.though

41.---Didyouasktheguard_______happened?

---Yes,hetoldmeall_______heknew.

A.what;thatB.what;whatC.which;whichD.that;that

42.Ishallneverforgetthoseyears_______Ilivedonthefarmwith

thefarmers,_______hasagreateffectonmylife.

A.when;whoB.that;whichC.which;thatD.when;which

43.Thenumberofthepeoplewho_______cars_______increasing.

A.owns;areB.owns;isC.own;isD.own;are

44.Duringthedays________,heworkedasaservantattheBrowns.

A.followedB.followingC.tofollowD.thatfollowed

45.Isoxygentheonlygas_______helpsfireburn?

A.thatB./