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    精英家教网 > 高中英语 > 题目详情
    12．She ___ have attended the meeting，for she was seeing a doctor then．（　　）
    A．shouldn'tB．mustn'tC．wouldn'tD．couldn't

    分析 她不可能参加会议，因为那时她在看医生．

    解答 答案D．
    "shouldn't have done"用来表虚拟，意思是"本来不应该做某事，但实际做了"；"mustn't不能用来表推测，也不表虚拟，没有"mustn't have done"这种结构；"wouldn't have done"用来表虚拟，意思是"过去将不会做…（实际上做了）"；couldn't have done用来表示对过去发生事情的推测，意思是"过去不可能做…"．根据句子所表达的意思"她不可能参加会议"可知，本题考查的是情态动词表推测，故答案选D．

    点评 本题考察的是情态动词表示推测．情态动词表推测是高考的重要考察点之一，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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