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【题目】We must do everything we can ______ waste water from running into rivers.
A.prevent
B.prevented
C.preventing
D.to prevent

【答案】D
【解析】空格后是动词不定式表示目的,作目的状语,符合句意"我们必须做我们所能做的一切去阻止废水流进河里。"

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