【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
在线课程【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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