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    Turn off the switch anything goes wrong with the machine. A. so B. when C. while D. because 【查看更多】

     

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    Turn off the switch ____anything goes wrong with the machine.

    A. so B. when 　 C. while 　D. because

     

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    Turn off the switch ________ anything goes wrong with the machine．

    [　　]

    A．so

    B．when

    C．unless

    D．because

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