【題目】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】

試題分析：考查非謂語動詞 。句意：眾所周知，被污染的空氣和水對人們的健康有害，polluted 過去分詞做形容詞，故選D項。

考點 : 考查非謂語動詞

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