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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

    1、D

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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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