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    精英家教网 > 高中英语 > 题目详情
    —Why does Mary look so worried today?
    —I’m not sure, but she _____ a small accident driving here.
    A．must haveB．might haveC．must have hadD．might have had
    D

    试题分析：考察情态动词用法。“情态动词+have done”表示对过去情况的虚拟或者推测；“情态动词+动词原形”表示对现在情况的虚拟或者推测。句义：—为什么Mary今天看起来很担忧啊？—我不清楚，也许是在开车来的时候，出了点小事故吧！根据句义可知是对过去发生的事情的推测。Must have done一定做了某事，表示对过去所发生的事情有把握的肯定推测。Might have done也许做了某事，表示没有把握的推测。故D正确。
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