(英语)英语名词性从句练习题20篇
【英语】英语名词性从句题20套(带答案)含解析
【英语】英语名词性从句题20套(带答案)含解析一、初中英语名词性从句1．It was never clear ________ the man hadn't reported the accident sooner.A. thatB. howC. whenD. why【答案】 D【解析】【分析】句意：这名男子没有早点报告这次事故的原因根本没有搞清楚。
It在句中是形式主语，真正的主语是why引导的主语从句。
故选D。
【点评】考查名词性从句，本题涉及why引导的主语从句。
2．Some people believe _______ has happened before or is happening now will repeat itself in the future.A. whateverB. wheneverC. whereverD. no matter what【答案】 A【解析】【分析】句意：一些人认为之前发生的或现在正在发生的任何事情在将来都会重复发生。
Whatever has happened before or is happening now是一个主语从句，whatever既引导起这个主语从句，也在句中做主语。
BC项都属于副词的性质，都不能做主语，通常只能做状语；no matter what只能用来引导状语从句，故选A。
【点评】考查名词性从句，本题涉及"特殊疑问词+ever"引导的主语从句。
3．_______ are playing an important part is well known to us all.A. That whoB. Those whoC. Who thatD. Who【答案】 D【解析】【分析】考查主语从句。
句意：谁起着重要作用，这是众所周知的。
主语从句缺少引导词，从句缺少主语，故选D。
4．—Tell me something about your adventure in the rainforest, please.— We lost our way in the forest and ___ made matters worse was ___ night began to fall.A. what; thatB. it; thatC. it; becauseD. what; because【答案】 A【解析】【分析】考查名词性从句的连接词。
必备英语名词性从句专项练习(附答案)含答案解析
必备英语名词性从句专项练习(附答案)含答案解析一、初中英语名词性从句1．____ he will offer us enough help doesn't matter a lot to our success.A. IfB. WhetherC. BeforeD. How【答案】 B【解析】【分析】句意：他是否提供帮助对于我们的成功没有什么关系。
If不可以引导主语从句，故选B。
【点评】考查名词性从句，本题涉及whether引导的主语从句的应用。
2．_____ is known to us all is that China has launched Shenzhou VII spaceship, ____ made the country's first spacewalk successful.A. That; whatB. What; whichC. It; whichD. As; that【答案】 B【解析】【分析】句意：众所周知，中国已经发射了神州7号宇宙飞船，这是中国首次成功的太空行走。
第一空处为主语从句，从句缺少主语，需用what引导；第二空所在句子是个定语从句，先行词为整个主句的内容，从句中缺少主语，需用which引导。
故选B。
【点评】考查名词性从句和定语从句，本题涉及主语从句和非限制性定语从句的应用。
3．______excited Jenny most was ______ she finally succeeded in ______seemed to be the most difficult exam to him.A. That; that; whichB. What; that; whatC. That; because; thatD. What; because; which 【答案】 B【解析】【分析】句意：珍妮最兴奋的是对他来说似乎是最困难的考试，她终于成功了。
(完整版)名词性从句专项练习及答案
高中英语名词性从句专项练习一、用that或what填空1.______ he wants is a book.2. ______ he wants to go there is obvious.3.The result is ______ we won the game.4.This is _____ we want to know.5.Is _____ he told us true ?6.We should pay attention to ______ the teacher is saying.7. I have no doubt _____ he will come.8. I have no idea _____ he did that afternoon.9._____ has made China_____ it is now?10．we can’t get seems better than we have .11.A computer can only do you instructed it to do .12.He became so angry he couldn't speak .13.There is the city we visited last year .14.There is no doubt the price of cars will go down .15.None of us has a clear idea the others want to do .16.Do he or she tells you to do .17. he did surprised us .18. he did so surprised us .19.This is all I know.20.This is I know.21._____ you have done might do harm to other people.22._____ _ he said at the meeting astonished everybody present.23______ you don't like him is none of my business.24.The fact ____ he is a model teacher is well-known.25.They expressed the hope____ they would come over to China again.二、用if 或whether填空1. I asked her __________ she had a bike.2.______ we will hold a party in the open air tomorrow depends on the weather.3. We’re worried about ________ he is safe.4. I don’t know ___________ he is well or not.5. I don’t know ________ or not he is well.6. The question is _______ he should do it.7.The doctor can hardly answer the question___ _ the old man will recover soon.8. I don’t know _______ to go.9.______ you are not free tomorrow, I’ll go without you.10.It depends on she will come.11.I have no idea he will be back .12.We must stick to our promise or no .13. It is valuable ,I can't say .14.I don’t know he is lying or not.15. I didn’t know to laugh or to cry.三、改正下列句子中的错误，每句一处错。
名词性从句练习(附答案)
练习: 名词性从句一、判断下列各句哪句含有名词性从句, 并指出是什么从句:e.t.be.2.Th.trut.tha.th.eart.tur.aroun.th.su.i.know.t.all.3.I.wa.snowin.whe.h.arrive.a.th.station.4.Ho.h.persuade.th.manage.t.chang.th.pla.i.interestin.t.u.all.5.Th.new.tha.the.ha.wo.th.gam.soo.sprea.ove.th.whol.school.6.Th.new.tha.yo.tol.m.yesterda.wa.reall.disappointing.e.t.live.8.H.spok.a.i.h.understoo.wha.h.wa.talkin.about.9.D.yo.remembe.th.teache.wh.taugh.u.Englis.a.middl.school?10..wonde.wh.sh.refuse.m.invitation.二、用适当的连词填空:1..can’.decid.___________.dictionar..shoul.buy.2.That’.___________.h.refuse.m.invitation.3..a.ver.intereste.i.___________.h.ha.improve.hi.pronunciatio.i.suc..shor.time.4.___________.w.nee.i.mor.time.5.Th.fac.___________.sh.ha.no.sai.anythin.a.th.meetin.surprise.everybody.6.___________.an.___________.the.wil.mee.ha.no.bee.decide.yet.7.Pleas.tel.m.___________.yo.ar.waitin.for.8.I.tha.___________.yo.ar.lookin.for?9.Woul.yo.pleas.tel.m.___________.th.neares.pos.offic.is?10..don’.kno.___________.h.wil.agre.t.th.pla.o.not.三、选择填空:1.D.yo.se.____. .mean?A.tha.B./C.howD.what2.Tel.me____.i.o.you.mind.A.thatB.whatC.whic.....D.why3.W.mus.stic.t.____.w.hav.agree.on.A.whatB.thatC./D.how4.Le.m.se._____.A.tha.ca..repai.th.radioB.whethe.-.ca.repai.th.radioC..ca.repai.th.radioD.whethe.ca..repai.th.radio5.Kee.i.min._____.A.tha.th.teache.saidB.wha.di.th.teache.sayC.tha.di.th.teache.say ..D.wha.th.teache.said6.Coul.yo.advis.m._____?A.whic.boo.shoul..rea.firstB.wha.boo.shoul..rea.firstC.tha.boo..shoul.rea.firstD.whic.boo..shoul.rea.first7.H.wa.criticize.fo._____.A.h.ha.don.it .B.wha.h.ha.don.C.wha.ha.h.don..D.tha.h.ha.don.it8.Woul.yo.kindl.tel.m._____?A.ho.ca..ge.t.th.Beijin.Railwa.StationB.ho..ca.ge.t.th.Beijin.Railwa.StationC.wher.ca..ge.t.th.Beijin.Railwa.StationD.whethe.ca..ge.t.th.Beijin.Railwa.Station9.Mrs.Smit.wa.ver.muc.impresse.b._____.A.wha.ha.sh.see.i.ChinaB.tha.sh.ha.see.i.ChinaC.wha.sh.ha.see.i.ChinaD.whic.ha.sh.see.i.China10.W.too.i.fo.grante.___ingingin.notD.wer.the.no.coining11..reall.don’.kno._____A..shoul.d.nextB.wha.shoul..d.nextC.wha..shoul.d.nextD.ho..shoul.d.next12.I’.afrai._____.A.th.littl.gir.wil.hav.t.b.operate.onB.tha.wil.th.littl.gir.hav.t.operat.onC.th.littl.gir.wil.hav.t.operat.onD.tha.wil.th.littl.gir.hav.t.b.operate.on13.Sh.walke.u.t.____..A.wher.di..stan.B.wher..stood.C..stoo.ther.D.wher..stoo.there14.Ca.yo.tel.m._____?A.wh.i.tha.gentlemanB.tha.gentlema.i.whoC.wh.tha.gentlema.isD.who..i.tha.gentleman15.We’l.giv.yo._____.A.tha.d.yo.needB.wha.d.yo.needC.whateve.yo.needD.whethe.d.yo.need16.The.wan.u.t.kno.____.A.wha.ca.the.B.wha.the.canC.ho.the.ca..D.ho.ca.they17.W.mus.pu.____.int.practice.A.wha.w.hav.learnedB.tha.w.hav.learnedC.tha.hav.w.learnedD.wha.hav.w.learned18.Di.sh.sa.anythin.abou._____?A.tha.th.wor.wa.t.b.doneB.ho.wa.th.wor.t.b.doneC.tha.wa.th.wor.t.b.doneD.ho.th.wor.wa.t.b.done19.H.wa.neve.satisfie.wit._____.A.wha.sh.ha.achievedB.ha.wha.sh.achievedC.sh.ha.achievedD.tha.sh.achieved20.Thes.photograph.wil.sho.yo._____.A.wha.doe.ou.villag.loo.likeB.wha.ou.villag.look.likeC.ho.doe.ou.villag.loo.likeD.ho.ou.villag.look.like21.Pete.insiste.____.h.pa.th.bill.A.o.thatB.whatC.thatD.o.which22.The.urge.____.th.librar.ope.durin.th.vacation.A.whenB.whereC.whyD.that23.W.wis.w.coul.hav.learne.____.whe.w.wer.a.hig.school.A.wha.yo.di..B.tha.yo.ha.doneC.tha.wha.yo.di.D.wha.di.yo.do24.1 will describe to you _____ I saw when there.A.whatB.thatC.whic....D./25.Fro.____..shoul.sa.h.i..goo.worker.A.wha..kno.o.himB.tha..d.kno.o.himC.wha.d..kno.o.himD.tha.d..kno.o.him26..wil.giv.thi.dictionar.t._.want.t.hav.it.A.whomeve...B.anyone .C.whoeverD./27._____ they will come here hasn’t been decided yet.A.WhatB.ThatC.WhenD.Where28.____.wa.sai.her.mus.b.kep.secret.A.Wh.....B.Th.thingC.Whateve..D.Where29.I.i.stil..questio.____.w.shal.hav.ou.sport.meet.A.ifB.thatC.whatD.when30.I'.goin.anyway.____.sh.wil.g.i.u.t.he.t.decide.A.I.o.notB.Whethe.o.notC.IfD.That31.I.i.strang.____.sh.hav.lef.withou.sayin..word.A.thatB.whatC.whyD.how32.I.i.ver.clea.____.ou.polic.i..correc.one.A.whatB.thatC.wh......D.where33.____.M.Zhan.sai.i.quit.right.A.Tha....B.WhenC.WhatD.Whether34.I.ha.bee.decide.____.h.wil.b.sen.there.A.ifB.whethe.C.whyD.that35.I.doesn..matte._____.bac.o.not.A.ifB.whetherC.thatD.when36.It’..grea.pit.____.w.won’.b.abl.t.finis.th.tas.o.time.A.whe....B.thatC.wh......D.where37.I.happene.____..wasn'.ther.tha.day.A.whe....B.whyC.wher.....D.that38._____ you have done might do harm to other people.A.Wha....B.ThatC.Whic.....D.Th.things39.____s.ough.t.tur.of.th.lights.A.Anyon...B.Th.personC.Whoeve....D.Who40._____ the 2000 Olympic Games won't be held in Beijing is known to all.A.Whethe...B.IfC.Wheneve....D.Tha.41.____.fail.t.se.thi.wil.mak..bi.mistake.A.Tha.B.WhoeverC.Whethe....D.Whethe.o.not42._.w.nee.mor.equipmen.i.quit.obvious.A.Wha....B.WhetherC.ThatD.Whatever43.Ha.i.bee.announce._____?A.whe.ar.th.plane.t.tak.offB.tha.ar.th.plane.t.tak.offC.wher.ar.th.plane.t.tak.offD.whe.th.plane.ar.t.tak.off44.Tha.i.____.w.al.suppor.hi.idea.A.whatB.whyC.whereD.when45.That’.____.w.shoul.do.A.thatB.whatC.howD.why46.____.i.troublin.m.i.____..don’.understan.____.h.saidA.What.that.whatB.What.what.whatC.That.that.whatD.Why.that.which47.Thing.wer.no.____.the.seeme.t.be.A.whenB.whyC.thatD.what48.That’.____..wan.t.say.A.al.whatB.whatC.al.whichD.wha.that49.That’.____..A.wher.ou.difference.lieB.ou.difference.li.thereC.wher.d.ou.difference.lieD.tha.wher.ou.difference.lie50.Tha.i.____..A.wher.live.h.thereB.wher.di.h.liveC.wher.h.livedD.tha.wher.h.lived参考答案一、1.表语从句；2.同位语从句；3.不是；4.主语从句；5.同位语从句；6.不是；7、表语从句；8、宾语从句；9、不是；10、宾语从句二、1.which.2.why.3.how.4.What.5.that.6.when.where.7.who(m).8.what.9.where.10.whether三、1~5 DBABD 6~10 DBBCA 11~15 CABCC 16~20 BADAB 21~25 CDAAA26~30 CCCDB 31~35 ABCDB 36~40 BDACD 41~45 BCDBB 46~50 ADBAC。
八年级英语名词性从句专项练习20题
八年级英语名词性从句专项练习20题1. I don't know ________ he will come tomorrow.A. ifB. whenC. whatD. where答案：A解析：“I don't know”后接宾语从句，根据句意“我不知道他明天是否会来”，“是否”用“if”或“whether”，选项中只有“if”，所以选 A 。
2. Can you tell me ________ you were born, Betty?A. whoB. whatC. whenD. that答案：C解析：根据句意“贝蒂，你能告诉我你什么时候出生的吗？”，询问时间用“when”，故选C 。
3. Please tell me ________ you have seen the film.A. ifB. thatC. what答案：A解析：“Please tell me”后接宾语从句，根据句意“请告诉我你是否看过这部电影”，“是否”用“if”或“whether”，故选A 。
4. I want to know ________ he has been to Beijing.A. ifB. thatC. howD. where答案：A解析：“I want to know”后接宾语从句，根据句意“我想知道他是否去过北京”，“是否”用“if”或“whether”，故选A 。
5. She asked me ________ I could help her.A. whatB. thatC. ifD. where答案：C解析：“She asked me”后接宾语从句，根据句意“她问我是否能帮助她”，“是否”用“if”或“whether”，故选C 。
6. ______ makes the book so extraordinary is the creative imagination of the writer.B. WhatC. WhoD. Which答案：B解析：“What makes the book so extraordinary”是一个主语从句，what 在从句中作主语，表示“使这本书如此非凡的（东西）”。
(英语)英语名词性从句练习题20篇含解析
（英语）英语名词性从句练习题20篇含解析一、初中英语名词性从句1． is known to all is that the earth is smaller than the sun.A. AsB. WhatC. ItD. Which【答案】 B【解析】【分析】句意：众所周知地球比太阳小。
is known to all 是主语从句，从句中缺少主语，因此用what，选B。
【点评】考查名词性从句，本题涉及what引导的主语从句。
2．___ surprised me most was ____the girl passed the driver test.A. That; thatB. What; howC. What; thatD. That; why【答案】 C【解析】【分析】句意：最让我吃惊的是那个女孩通过了驾驶考试。
___ surprised me most是一个主语从句，从句中缺少主语，故填what；____the girl passed the driver test 是一个表语从句，句中不缺少成分，故填that。
因此选C。
【点评】考查名词性从句，本题涉及what引导的主语从句和that引导的表语从句。
3． is clear to the members of the committee is that the President will not give in to their demands.A. WhoB. ItC. AsD. What【答案】 D【解析】【分析】句意：委员会成员清楚的是，总统不会向他们的要求让步。
that the President will not give in to their demands.这个句子作表语； is clear to the members of the committee这是主语从句，这里缺少主语从句的连接词，并且连接词在句中作主语，it是代词，不是了；连接词，故排除B；as作主语时，是在定语从句中，故排除C；who指人，根据表语指的事情，不是人，故排除A；what在主语从句中可以作主语或宾语，指事，符合句意，故选D。
(英语)英语名词性从句题20套(带答案)含解析
（英语）英语名词性从句题20套(带答案)含解析一、初中英语名词性从句1．They lost their way in the forest, and ________ made matters worse was that night began to fall.A. thatB. itC. whatD. which【答案】 C【解析】【分析】句意：他们在森林里迷路了，更糟糕的是天开始黑了。
根据连词and可知，本句需要一个引导主语从句的连接词，该词同时还要能在从句里充当主语。
that不能在句中作成分；it不能引导主语从句；which意为“哪一个”，不符合本句语境。
排除A、B、D三项。
故选C。
【点评】考查名词性从句，本题涉及what引导的主语从句的应用。
2． is clear to the members of the committee is that the President will not give in to their demands.A. WhoB. ItC. AsD. What【答案】 D【解析】【分析】句意：委员会成员清楚的是，总统不会向他们的要求让步。
that the President will not give in to their demands.这个句子作表语； is clear to the members of the committee这是主语从句，这里缺少主语从句的连接词，并且连接词在句中作主语，it是代词，不是了；连接词，故排除B；as作主语时，是在定语从句中，故排除C；who指人，根据表语指的事情，不是人，故排除A；what在主语从句中可以作主语或宾语，指事，符合句意，故选D。
【点评】考查名词性从句，本题涉及what引导的主语从句。
3．Some people believe _______ has happened before or is happening now will repeat itself in the future.A. whateverB. wheneverC. whereverD. no matter what【答案】 A【解析】【分析】句意：一些人认为之前发生的或现在正在发生的任何事情在将来都会重复发生。
【英语】 中考英语名词性从句20篇(附带答案解析)经典
【英语】中考英语名词性从句20篇(附带答案解析)经典一、名词性从句1．______excited Jenny most was ______ she finally succeeded in ______seemed to be the most difficult exam to him.A. That; that; whichB. What; that; whatC. That; because; thatD. What; because; which 【答案】 B【解析】【分析】句意：珍妮最兴奋的是对他来说似乎是最困难的考试，她终于成功了。
______excited Jenny most是主语从句，从句中缺少主语，因此用关系代词what ；_____ she finally succeeded in ...是表语从句，从句中不缺少成分，因此用引导词that；______seemed to be the most difficult exam to him.是宾语从句，从句中缺少主语，因此用关系代词what ，故选B。
【点评】考查名词性从句，本题涉及主语从句，表语从句和宾语从句。
2．It has been pointed out ________ plays a vital role in driving away one's anxiety is one's sweet childhood memories.A. what thatB. whichC. thatD. that what【答案】 D【解析】【分析】句意：有人指出，驱除焦虑所起着至关重要的作用是童年美好的回忆。
本句时一个主语从句，it作形式主语，真正的主语为that what plays a vital role in driving away one's anxiety is one's sweet childhood memories.，主语从句中又有一个主语从句，且此主语从句中缺少主语，所以用what引导。
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（英语）英语名词性从句练习题20篇一、初中英语名词性从句1．______ has caused great confusion is ______ he made it without anyone else's help. A. What; that. B. What; how. C. It; how. D. It; that.【答案】 B【解析】【分析】句意：让人极大困惑的是他如何在没有别人帮助的情况下做到这一点的。
表示“让人困惑的事情”用what引导主语从句，表示“如何做到的”用how表方式，引导表语从句。
故选B.【点评】考查名词性从句，本题涉及what引导的主语从句和how引导的表语从句。
2． is clear to the members of the committee is that the President will not give in to their demands.A. WhoB. ItC. AsD. What【答案】 D【解析】【分析】句意：委员会成员清楚的是，总统不会向他们的要求让步。
that the President will not give in to their demands.这个句子作表语； is clear to the members of the committee这是主语从句，这里缺少主语从句的连接词，并且连接词在句中作主语，it是代词，不是了；连接词，故排除B；as作主语时，是在定语从句中，故排除C；who指人，根据表语指的事情，不是人，故排除A；what在主语从句中可以作主语或宾语，指事，符合句意，故选D。
【点评】考查名词性从句，本题涉及what引导的主语从句。
3．_______ are playing an important part is well known to us all.A. That whoB. Those whoC. Who thatD. Who【答案】 D【解析】【分析】考查主语从句。
句意：谁起着重要作用，这是众所周知的。
主语从句缺少引导词，从句缺少主语，故选D。
4．It is a rule in his family that _______ comes home first should cook the dinner.A. anybodyB. whoC. whoeverD. who that【答案】 C【解析】【分析】句意：在他的家里有个规定，就是先到家的人要先做饭。
whoever 有两个词义：1no matter who，在这种用法时引导一个让步状语从句；2anybody that，在这种用法时，它连接一个名词性从句，在本题中它连接的是主语从句。
这里就是第二个用法。
所以选C。
5．______ amazed the NBA world is ______ Kobe Bryant scored 81 points just in one game.A. That, whatB. What, thatC. That, thatD. What, what【答案】 B【解析】【分析】句意：使NBA世界惊讶的是Kobe Bryant在一场比赛中得了81分。
根据句意可知，句子主语是一个主语从句，引导词即起引导作用又要做从句的一个成分，所以第一空填What；第二空是that引导的表语从句，只起引导作用，故选B。
【点评】考查名词性从句，本题涉及关系代词what引导的主语从句和表语从句的应用。
6．______ is our belief that improvements in health care will lead to a stronger, more prosperous economy.A. WhichB. WhatC. ItD. As【答案】 C【解析】【分析】句意：医疗保健的进步将促进一个更强大、更繁荣的经济，这是我们的信念。
that引导的是主语从句，故空格处应该用it作形式主语，代替真正的that引导的主语从句。
故答案选C。
【点评】考查it的用法，以及主语从句的应用。
7．They lost their way in the forest, and ________ made matters worse was that night began to fall.A. thatB. itC. whatD. which【答案】 C【解析】【分析】句意：他们在森林里迷路了，更糟糕的是天开始黑了。
根据连词and可知，本句需要一个引导主语从句的连接词，该词同时还要能在从句里充当主语。
that不能在句中作成分；it不能引导主语从句；which意为“哪一个”，不符合本句语境。
排除A、B、D三项。
故选C。
【点评】考查名词性从句，本题涉及what引导的主语从句的应用。
8．________ has been proved is that animals and insects have their own languages.A. WhatB. AsC. ItD. That【答案】 A【解析】【分析】句意：已被证明的是动物和昆虫有自己的语言。
根据is判断，此处为主语从句，分析该从句，缺少主语，用what。
选A。
【点评】考查名词性从句，本题涉及what引导的主语从句的应用。
9．Exactly _________ the potato was introduced into Europe is uncertain, but it was probably around 1565.A. whetherB. whenC. whyD. how【答案】 B【解析】【分析】句意：土豆被引进欧洲具体的事件不被确定，但是可能是在1565年左右。
根据时间状语round 1565得知这里是指时间不确定。
故选B。
【点评】考查名词性从句，本题涉及when引导的主语从句。
10．_______ is troubling me is ______ I don't understand ________ he saidA. What; that; whatB. What; what; whatC. That; that; whatD. Why; that; which 【答案】 A【解析】【分析】句意：我烦恼的是我不明白他说的话。
第一空是主语从句，从句中缺主语，要用What；第二空是表语从句，从句不缺成分，所以要填that；第三空是宾语从句，从句中的动词understand缺宾语，要填what。
故选A。
【点评】考查名词性从句，本题涉及主语从句，表语从句和宾语从句的应用。
11．______excited Jenny most was ______ she finally succeeded in ______seemed to be the most difficult exam to him.A. That; that; whichB. What; that; whatC. That; because; thatD. What; because; which 【答案】 B【解析】【分析】句意：珍妮最兴奋的是对他来说似乎是最困难的考试，她终于成功了。
______excited Jenny most是主语从句，从句中缺少主语，因此用关系代词what ；_____ she finally succeeded in ...是表语从句，从句中不缺少成分，因此用引导词that；______seemed to be the most difficult exam to him.是宾语从句，从句中缺少主语，因此用关系代词what ，故选B。
【点评】考查名词性从句，本题涉及主语从句，表语从句和宾语从句。
12．________ manners are very important in every country is known to all，but the trouble is that different countries have different ideas about ________ good manners are.A. That; whatB. That; thatC. What; thatD. What; what【答案】 A【解析】【分析】句意：众说周知，礼貌在每一个国家中都是非常重要的，但是麻烦是，不同的国家对于什么是良好的礼貌有着不同的认识。
逗号前有两个谓语动词，一个是are，一个是is known，故是两句话，需填连词连接这两句话，根据句意可知，前面是主语从句，故填that，此处的that，只起连接作用不作任何成分。
about是介词，其后是个句子故应填连词把这两句话连接起来，所缺词作are的表语，故填what。
因此选A。
【点评】考查名词性从句，本题涉及that引导的主语从句和what引导的宾语从句。
13．_______is known to us all is that Johnson broke his promise ______ he would come to help me as soon as possible.A. It; thatB. What; thatC. As; whichD. What; which【答案】 B【解析】【分析】句意：我们都知道，Johnson违背了他会尽快来帮助我的诺言。
分析句子结构可知，第一空为主语从句，从句中缺少主语，所以用what，第二空为同位语从句，从句结构完整，所以用that解释promise的内容，故选B。
【点评】考查名词性从句，本题涉及主语从句和同位语从句。
14．It was he said disappointed me.A. that; whatB. what; thatC. that; whichD. which; that【答案】 B【解析】【分析】句意：正是他说的话让我很失望。
这是一个强调句型,"it is/was that..."是固定搭配,"what he said"是被强调部分, 你可以发现去掉"it was that"后, 句子仍然完整。
"what he said"做主语,主语从句中"said"缺宾语用what补足，故选B。
【点评】考查主语从句的强调形式。
15． is known to all is that the earth is smaller than the sun.A. AsB. WhatC. ItD. Which【答案】 B【解析】【分析】句意：众所周知地球比太阳小。