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    精英家教网 > 高中英语 > 题目详情
    —Listen! There is a knock on the door. Who _____ it be?
    —It must be Jack. Just now I sent for him.
    A．shallB．canC．mustD．might
    B
    考察情态动词，四个选项在第三人称后分别表示会；应该、能、一定必须和可能。might语气比can弱。在表示猜测的时候，might用于肯定推测，can用于否定推测。根据题意选B，他能是谁呢？
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