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    29．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 【查看更多】

     

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    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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    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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