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    9． , it began to run unexpectedly. A．While cleaning the machine B．To clean the machine C．He was cleaning the machine D．While he was cleaning the machine 【查看更多】

     

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    ________, it began to run unexpectedly.

    [　　]

    A．While he was cleaning the machine

    B．While cleaning the machine

    C．To clean the machine

    D．He was cleaning the machine

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