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    【题目】—Who______ it be that is knocking at the door？

    —It ______ be Father，but I’m not sure．

    A．can; must B．can; may

    C．must; can D．may; must

    【答案】B

    【解析】

    试题分析：句意：--可能是谁在敲门呢？--或许是爸爸，但是我不确定。Can表否定或疑问猜测。May表可能性小的猜测。故选B。

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