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We must take action _________ waste water from running into rivers.

A. keep B. kept C. to keep D. keeping

C 【解析】句意:我们必须采取行动来防止污水流入河流。keep… from阻止; take action采取行动;空格后的非谓语动词部分是表示采取行动的目的,所以应该用动词不定式,故选C。
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