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    All the mobile phones must be during the meeting. A. kept off B. keep off C. keep from D. kept form 【查看更多】

     

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    Attention，please! All the mobile phones _____________during the meeting．

    A．must keep off                                   B．have to keep 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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    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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    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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