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【题目】We must protect the ecosystem of the forest from________.

A.polluteB.pollutedC.being pollutedD.polluting

【答案】C

【解析】

句意:我们必须保护森林的生态系统不受污染。

考查非谓语动词。pollute污染,动词原形;polluted污染,动词过去式或者过去分词;being polluted被污染,动名词被动结构;polluting污染,现在分词或者动名词形式;根据句意理解可知,这里表达的是“保护……免遭……”,结构是protect sb. from doing sth.,而这里the ecosystem of the forestpollute之间是被动关系,而from是介词,所以这里应该用动名词的被动形式,形式是being polluted,故选C

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