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    such heavy pollution already.it may now be too late to clean up the river． Having suffered 【查看更多】

     

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    ________ such heavy pollution already，it may now be too late to clean up the river．

    [　　]

    A．Having suffered
    B．suffering
    C．To suffer
    D．Suffered

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    ________ such heavy pollution already，it may now be too late to clean up the river．

    [　　]

    A．Having suffered
    B．suffering
    C．To suffer
    D．Suffered

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