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    the lights before you leave the office or you will be fined. A. Turning off B. Turned off C. Turn off D. To turn off 【查看更多】

     

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    ________ the lights before you leave the office or you will be fined．

    [　　]

    A．Turning off

    B．Turned off

    C．Turn off

    D．To turn off

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