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    There are several chemical factories waste water into the river. A. pouring B. pour C. to pour D. poured 【查看更多】

     

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    There are several chemical factories _______ waste water into the river.

    [     ]

    A. pouring
    B. pour
    C. to pour

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    There are several chemical factories ______ waste water into the river.
    A. pours       B. pour           C. pouring

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    There are several chemical factories ______ waste water into the river.
    A. pours       B. pour           C. pouring

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    There are several chemical factories        waste water into the river.
    A．pour             B．pouring              C．pours

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    There are several chemical factories        waste water into the river.

    A．pour             B．pouring              C．pours

     

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