Only when he started to explain ________ the reason for this.A.she realized B.did she realizeC.she had realized D.had she realizedAfter that we never saw her again nor _______ from her.A.did we hear B.we heardC.had we heard D.we have

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Onlywhenhestartedtoexplain________thereasonforthis.A.sherealizedB.didsherealizeC.shehadrealizedD.had

Only when he started to explain ________ the reason for this.A.she realized B.did she realizeC.she had realized D.had she realizedAfter that we never saw her again nor _______ from her.A.did we hear B.we heardC.had we heard D.we have
Only when he started to explain ________ the reason for this.
A.she realized B.did she realize
C.she had realized D.had she realized
After that we never saw her again nor _______ from her.
A.did we hear B.we heard
C.had we heard D.we have heard
Scarcely _______ the room _______ the phone rang.
A.I had entered…when B.Had I entered…then
C.had I entered…when D.have I entered…when
希望有详细的讲解,顺便说说每句的意思~
参考答案是BAC

Only when he started to explain ________ the reason for this.A.she realized B.did she realizeC.she had realized D.had she realizedAfter that we never saw her again nor _______ from her.A.did we hear B.we heardC.had we heard D.we have
1.Only when he started to explain( did she realize ) the reason for this.
就在他开始解释的时候,她才明白其原因.
Only强调状语置于居首时,使用部分倒装,即把谓语的一部分(助动词、情态动词和系动词be)放到主语前.本句中 Only 强调时间状语when he started to explain,所以答案应选B.
2.After that we never saw her again nor( did we hear )from her.
从那以后,我们再也没见过她,也没有关于她的任何消息.
否定副词、连词neither,nor,never,hardly,scarcely,little等及含有否定词的介词短语,如in no time等置于句首时,使用部分倒装.
3.Scarcely (had I entered) the room( when) the phone rang.
我一进房间电话铃就响了.
和上一题一样,scarcely放于句首句子使用部分倒装.另外,Hardly / Scarcely had sb.done sth.when...是固定结构.

b;a;c
当他开始解释的时候,她才明白原因;
自那以后,我们再也没见过她,也没听到关于她的任何消息;
我刚进门时电话就响了;
具体原因:only,nor,scarcely几个次放在那里,肯定是倒装,这个就不罗嗦了,剩下的就是时态问题
第一句看到when,一般是指一个时间点而不是一段时间,所以没必要完成时的;
第二句看到nor,时态和never一致;...

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b;a;c
当他开始解释的时候,她才明白原因;
自那以后,我们再也没见过她,也没听到关于她的任何消息;
我刚进门时电话就响了;
具体原因:only,nor,scarcely几个次放在那里,肯定是倒装,这个就不罗嗦了,剩下的就是时态问题
第一句看到when,一般是指一个时间点而不是一段时间,所以没必要完成时的;
第二句看到nor,时态和never一致;
第三句Hardly / Scarcely had sb.done sth.when... 固定结构,背出来

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D.had she realized :only when接的是过去式,后面的从句倒装且需要是过去完成时:直到他开始讲解,她才明白原因。
A:never nor的句型,并列的时态,所以选择过去式,但是nor后面要倒装,用did引导:从那以后,我们再没有见过她,也没有收到过她的信。
C: Scarcely ....when句型=hardly....when:一...就...,通常放在...

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D.had she realized :only when接的是过去式,后面的从句倒装且需要是过去完成时:直到他开始讲解,她才明白原因。
A:never nor的句型,并列的时态,所以选择过去式,但是nor后面要倒装,用did引导:从那以后,我们再没有见过她,也没有收到过她的信。
C: Scarcely ....when句型=hardly....when:一...就...,通常放在句首,需要倒装,
我刚一进房间就听到了电话铃响。
倒装句子的结构很多,具体的你去这里看下
http://zhidao.baidu.com/question/1227537.html

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He started working with puppets when he was only eight years old.译成中文 started golfing when he was only ten months old的意思 For exampie ,Tiger Woods started golfing when he was only ten menths old.英文翻译 he first started a___ when when he was only three ,he started having ___ lessons .He could think of nothing but music. 英语帮忙改错Only when it started to rain he noticed that he had left his raincoat somewhere选项A it startedB he noticedC had leftD somewhere He started his own ____when he was only eighteen.(busy) he started swimming when he was four years old,同义句he started swimming ( ) ( ) he started swimming when he was four years old 等于 he started swimming _____the____of four. He started swimming when he was four years old .(同义句) He started swimming( )( ) he started to learn the piano when he was tom started golfing when he _____(be)ten years old what is han s thought when he first started skating I smelt a reat when he started being so kelpful 英语翻译Jane:Do you know about Craig Kielburger?Kangkang:Yes.He is from Canada and he started Free the Children.Michael:He was only twelve years old when he started to help poor children.Maria:Yes.Free the Children has built over 700 school rooms 英语翻译1) you are never too young to start doing things .for example,tiger woods started golfing when he was only ten months old.mozart started writing music when he was four years old.and ronaldo,the great brazilian soccer plyer.plyered for his He started drawing when he was three yeas old,and when he is five,he is alre中文翻译 for example tiger woods started golfing when hewas only ten months ole 什么意思啊