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    before you leave the lab. A. Make sure that the windows are shut B. Make sure to shut the windows C. To make sure that the windows are shut D. To be sure to shut the windows 【查看更多】

     

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    ________ before you leave the lab.

    [　　]

    A．Make sure that the windows are shut

    B．To make sure that the windows are shut

    C．Making sure to shut the windows

    D．To be sure to shut the windows

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