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    Students remain in their seats until all the exam papers have been collected. A. must B. shall C. may D. can 【查看更多】

     

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    Students  ______ remain in their seats until all the exam papers have been collected.

    A. must            B. shall              C. may              D. can

     

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    Students ________ remain in their seats until all the exam papers have been collected．

    [　　]

    A．must

    B．shall

    C．may

    D．can

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