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    精英家教网 > 高中英语 > 题目详情
    ---who______it be that is knocking at the door?
    ---It_______be Father, but I’m not sure.
    A．can, mustB．can, mayC．must, canD．may, must
    B

    试题分析：句意：--敲门的会是谁？---有可能是父亲，但是我不是很肯定。第一空填can，用于否定或疑问句表示推测“可能”，第二空填may，因为说话人不是很确定，but I’m not sure.所以选B。
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