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    2．( )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 【查看更多】

     

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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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