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    Mobile phones must be kept off d the meeting. 【查看更多】

     

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    (改写) Mobile phones must be kept off d_ the meeting.

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    All the mobile phones must be ______ during the meeting.
    [     ]
    A. kept fit
    B. kept quiet
    C. kept off
    D. kept away

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    All mobile phones must _______during the meeting __________we call hear the report clearly．

    A．keep away；ever since             B．not open：until

    C．be kept closed；if                 D．be turned off：so that

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    Attention, please! All the mobile phones ______ during the meeting.

    A. must keep off           B. have kept off     C. are keeping off   D. must be kept off

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    Attention, please! All the mobile phones  ______ during the meeting.

    A. must keep off   B. have kept off     C. are keeping off      D. must be kept off

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