题目内容

【题目】It is well known that _________ air and water are harmful to people’s health.

A. pollute B. polluting

C. to pollute D. polluted

【答案】D

【解析】

试题分析：考查非谓语动词 。句意：众所周知，被污染的空气和水对人们的健康有害，polluted 过去分词做形容词，故选D项。

考点 : 考查非谓语动词

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