3．选C。如用with则全句的逻辑关系不成立，而用D项其语法结构有错。in the past years已经告诉我们应与过去事实相反的条件从句，所以只有C是对的，B项用来表示与现在事实相反，也应排除。B、C这两种用法只能表示虚拟条件，不能表示真实条件，其意思是“如果没有”。
4．选C。虚拟条件从句虽是指过去，但从其与主句的逻辑关系上分析，主句只能是现在，故选C，从now 一词也可得出这一结论。
5．选B。分析方法同上。
6．选C。otherwise在这是一个虚拟条件从句的替代词，它代替了if he hadn't done his best。
7．选A。从wish后的过去时间状语判断，这应该是一个对过去未能实现事情的一种愿望，故应使用过去完成时。
8．选A。在确定wish后从句的时态时，不要受wish本身时态的影响，它同对从句时态的确定毫无关系。问题的关键是要看wish和从句中的动词的时间先后关系，无论wish本身是何种时态，它与这个动词的时间关系是固定不变的，在变成间接引语时，我们会更能体会到这种关系：
He said，“I wish I had been there. ” He said that he wished he had been there.
wish的时态变了，可它与后面动词的时间关系并没有变。请参阅本章的语法说明。 9．选A。根据句意，这是一个与现在事实相反的比喻，准确地说，是一个与主句动词同时发生的一个动作，故用一般过去时的were。
10．选D。But for（如果没有）和without都可用于表示条件，并没有时间限制，它们既有If it were not for的意思，也有if it had not been for的意思。但前者只用来表示虚拟条件，而后者用于虚拟和真实均可。C 项表示与现在事实相反，这与主句不能成立。 11．选C。as if后时态的确定同wish一样，也不要受主句时态的影响，对它的分析请见上面第8题及其分析。
12．选C。but引出的内容是一个事实。
13．选B。从句用与过去事实相反的过去完成时才能合句意。 14．选B。从句只能指过去。
15．选A。主句中的now一词已表明是与现在事实相反。
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16．选A。从句应理解为与过去事实相反，故用过去完成时，句首的感叹句告诉我们，这是一个当前的情景，所以wouldn't后用进行时较妥。
17．选B。第一句虽用了一个现在时的疑问句，但“打碎”这个动作确是已经发生了。所以主从句都应视为过去事实相反。
18．选D。用与过去事实相反的否定句才合逻辑。
19．选C。从虚拟条件从句及其主句可判断出这是一个过去发生的否定的事实。 20．选D。从句是指过去，而主句是指现在。 B层次选题：（二）
1．It is strange that she ______ marry such an ugly man. A．would B．should C．shall D．must
2．It's not right that the meeting ______ off till tomorrow. A．must be put B．must put C．will be put D．be put
3．It was impossible that he ______ the train, for he had started out very early. A．could have missed B．must have missed C．should have missed D．should miss 4．It's a pity that he ______ such a good chance.
A．should miss B．should have missed C．has missed D．all the above
5．He tried to find some excuse for the debt, but I insisted that he ______ it off at once.
A．must pay B．ought to pay C．paid D．pay
6．Mr. Ford insisted that he ______ right, though the others didn't think so. A．should do B．should have done C．had done D．did 7．His pale face suggested that he ______ the sad news. A．should be told B．should have been told C．was told D．had been told
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8．He suggested that we ______ here at once.
A．should leave B．must leave C．left D．ought to leave 9．My order is that everyone ______ their own work in time. A．must complete B．completed C．completes D．complete
10．We've made the decision that we ______ at the school gate at 7 tomorrow morning. A．will gather B．are about to gather C．would gather D．should gather
11．----I'll be waiting for you at home. ---- ______ I were busy and couldn't come?
A．What if B．What when C． How if D．How when
12．After he was praised for what he had done, he said，“I ______ even better under harder conditions. ”
A．would do B．would have done C．did D．had done
13．It has been raining for a day, but even though it ______ , we ______ there by tomorrow.
A．hadn't rained, couldn't get B．hadn't rained, can't get C．didn't rain, couldn't get D．didn't rain, can't get 14．We could not have succeeded ______ your help.
A．but for B．without C．if it had not been for D．all the above
15．I dare say he is not your ture friend, because a true friend ______ differently when you were in trouble.
A．acted B．had acted C．would act D．would have acted
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16．Remember, science requires your whole life. and even if you ______ two lives, they ______ enough.
A．have, is B．have, isn't C．had, would be D．had, wouldn't be 17．It was a hard work, but divided into groups, we ______ it easily. A．might completed B．might have completed C．completed D．had completed
18．If only I ______ his advice, but I'm sorry I didn't.
A．would not take B．would not have taken C．didn't take D．hadn't taken 19．----Do you want the door to be painted green? ----I would rather it ______ blue.
A．would be painted B．is painted C．will be painted D．was painted 20．It's time we ______ to the concert. A．went B．go C．will go D．should go 答案与分析
1．选B。分析见本章语法说明。
2．选D。本句带有要求之意，故从句谓语用should型虚拟语气。D项中的should被省略。
3．选C。本句也带有惊讶之意，故从句须用should型虚拟语气。但由于是过去的事情所产生的惊讶，所以用should+不定式完成式。
4．选D。如选A，这表达了说话人对将来的事所发出的感叹，选B则是对已经过去的事情的感叹。选C则是一个直陈语气，即说话人对此并不一定感到十分惋惜，而是对此事的陈述。
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