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    14、Once environmental damage         , it will take many years for the system to recover.

    A．has done          B．is being done    C．is to be done    D．has been done

    14、D

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    科目：高中英语 来源： 题型：

    Once environmental damage         , it will take many years for the system to recover.

    A．has done          B．is being done    C．is to be done    D．has been done

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    科目：高中英语 来源：启东中学作业本高三英语(下) 题型：014

    Once the environmental damage ________, it will take many years for the system to recover.

    [　　]

    A．has done
    B．is to do
    C．does
    D．is done

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