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

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

C 【解析】句意：我們必須采取行動(dòng)來防止污水流入河流。keep… from阻止； take action采取行動(dòng)；空格后的非謂語動(dòng)詞部分是表示采取行動(dòng)的目的，所以應(yīng)該用動(dòng)詞不定式，故選C。
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