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【题目】We can protect our country by ________ the air, the water and the land.

A.not polluteB.pollutingC.not to polluteD.not polluting

【答案】D

【解析】

句意:我们可以通过不污染空气、水和土地来保护我们的国家。

by是介词,表示通过……方法,手段;by doing表示通过做……;by not doing sth.表示通过不做……。根据We can protect our country可知这里是通过不污染我们的空气,水和土地的方式来保护我们的国家。故选D

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