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    36．Attention, please! All the mobile phones must before the meeting starts． A．turn off B．be turned off C．be turning off 【查看更多】

     

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    Attention, please! All the mobile phones must______ before the meeting starts．

    A．turn off        B．be turned off        C．be turning off

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    Attention, please!All the mobile phones must ________ before the meeting starts．

    [　　]

    A．turn off

    B．be turned off

    C．be turning off

    查看答案和解析>>


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