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    精英家教网 > 高中英语 > 题目详情
    ---Mike must have known that.
    ---No, he ________. How _______ he?
    A．mustn’t, mustB．may not, mightC．couldn’t, canD．needn’t, need
    C
    must have done对过去的肯定的推测，否定句用can’t或couldn’t；第二空根据题意他怎么会知道，因此本题选C。
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