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     They _______ finding a solution to prevent the river being polluted.

    A. set up        B. set about

    C. set out        D. set off

     【解析】选B。句意： 他们着手寻找使河流不受污染的办法。set about 开始，着手，后接动名词；set out开始（做），后接不定式；set up设立，建立；set off出发，动身，使爆炸。

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