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    精英家教网 > 高中英语 > 题目详情
    ----- Mary looks very upset. She _______ failed to pass the exam.
    ----- I guess so. It's very difficult after all.
    A． must haveB．could haveC．should haveD．might have
    Ａ
    考察情态动词用法。Must have done一定做了某事；could have done本可以做某事；should have done sth本应该做某事；might have done也许做某事；结合句意可知A正确。句意：—玛丽看起来很难过。她一定考试没有及格。
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