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    The river has been polluted worse and worse．We must _______ new ways to solve the problem．

    A．catch up with        B．keep up with        C．come up with       D．make up with

    1、C

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    The river has been polluted worse and worse．We must _______ new ways to solve the problem．

    A．catch up with        B．keep up with        C．come up with       D．make up with

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