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

【答案】polluted

【解析】

句意:在過去,許多河流被嚴(yán)重污染,但是現(xiàn)在它們被清理干凈了。

“污染”可用pollute表示,動詞;分析句子可知,本句主語many rivers是動作pollute的承受者,此處應(yīng)使用被動語態(tài)結(jié)構(gòu),所以用其過去分詞形式。故填polluted。

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