题目内容

4．-John，how did your English exam go？
-I thought I _____，but in fact I came in the top 10% in the class．（　　）
A．should have failedB．might have failed
C．couldn't have failedD．mustn't have failed

分析 ---约翰，你英语考试怎么样？---我原以为可能会不及格，但事实上我是班级前10%．

解答 答案B．should have done表示对故去发生的事情的一种虚拟，意为"本来应该做某事而实际未做"；might have done表示对过去发生的事情把握性较小的一种推测，意为"过去可能会做某事"；couldn't have done表示对过去发生的事情把握性极大的一种推测，意为"过去一定不可能做…"；mustn't不能用来表推测，也不表虚拟，没有"mustn't have done"这种结构．本题考查情态动词表推测，故可排除A和D两项；再根据下文的语境"but in fact I came in the top 10% in the class"和句子所表达的意思"我原以为可能会不及格"可知答案选B．

点评 本题考查情态动词表推测的用法．"情态动词+have done"可表示对发生过的事作某种猜测、推测．这个结构是近几年高考情态动词的重点和难点．需要注意在肯定句或否定句中情态动词表推测时强弱程度．在肯定句中：must＞should＞can＞could＞may＞might，在否定句中：can't＞couldn't＞may not，＞might not．

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