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【题目】In the past, many rivers were ______________(污染) seriously, but now they are cleaned up.

【答案】polluted

【解析】

句意:在过去,许多河流被严重污染,但是现在它们被清理干净了。

“污染”可用pollute表示,动词;分析句子可知,本句主语many rivers是动作pollute的承受者,此处应使用被动语态结构,所以用其过去分词形式。故填polluted

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