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

A. set up        B. set about

C. set out        D. set off

 【解析】選B。句意： 他們著手尋找使河流不受污染的辦法。set about 開始，著手，后接動(dòng)名詞；set out開始（做），后接不定式；set up設(shè)立，建立；set off出發(fā)，動(dòng)身，使爆炸。

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