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【题目】We can protect (保护) the environment by ________ the air.

A.polluteB.not polluteC.pollutingD.not polluting

【答案】D

【解析】

句意:我们可以通过不污染空气来保护环境。

本题考查非谓语动词。pollute污染,是动词原形;not pollute不污染,是动词原形;polluting污染,是动名词或现在分词;not polluting不污染,是动名词。by doing sth通过做某事,根据we can protect the environment可知,要保护环境,应是不污染空气,故选D

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