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    7、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

    7、D

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    科目：初中英语 来源： 题型：

    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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    科目：初中英语 来源： 题型：

    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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    科目：初中英语 来源： 题型：

    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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