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    --Listen! Someone is knocking at the door. -- be Mary. She has just been to Nanjing. A. She mustn't B. It can' t C. It must D. She may 【查看更多】

     

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    Listen！Someone is knocking at the door．

    ________ be Mary．She has just been to Nanjing．

    [　　]

    A．She mustn't
    B．It can't
    C．It must
    D．She may

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