We must do what we can to ____________the river ______________.

A．protect; against pollutingB．stop; polluting
C．keep; being pollutedD．prevent; from being polluted

D

解析試題分析：考查固定詞組。固定詞組：prevent sb from doing sth阻止某人做某事；句意：我必須坐我們能做地阻止河流被污染。根據(jù)句意說明存在著被動的關系，故使用動名詞的被動語態(tài)。故D正確。
考點：考查固定詞組
點評：固定詞組：prevent sb from doing sth阻止某人做某事；在考查的時候注意與具體的語境結合考慮其主動或者被動的形式。

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