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    -Someone is knocking at the door. -Who it be? A. may B. must C. will D. can 答案:D 【查看更多】

     

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    －Someone is knocking at the door．Who _________ it be?

    －It must be the milkman．

    [　　]

    A．may

    B．must

    C．can

    D．need

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