题目内容

We must do what we can to ____________the river ______________.
A．protect; against pollutingB．stop; polluting
C．keep; being pollutedD．prevent; from being polluted
D

试题分析：考查固定词组。固定词组：prevent sb from doing sth阻止某人做某事；句意：我必须坐我们能做地阻止河流被污染。根据句意说明存在着被动的关系，故使用动名词的被动语态。故D正确。
点评：固定词组：prevent sb from doing sth阻止某人做某事；在考查的时候注意与具体的语境结合考虑其主动或者被动的形式。
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