题目内容
【题目】Our home river, Yitong River used to __________ seriously, but now it's as clear as a mirror.
A.polluteB.pollutingC.is pollutedD.be polluted
【答案】D
【解析】
句意:我们的家乡河流,伊通河曾经污染严重,但现在它像镜子一样清澈。
动词固定搭配。pollute污染,动词原形;polluting动名词;is polluted ;D. be polluted被动语态。根据but now it's as clear as a mirror. 但现在它像镜子一样清澈。结合Yitong River used to ___ seriously,可知是伊通河过去被污染严重,used to do sth过去常常做某事,这里的主语和动词之间存在被动关系,所以用被动语态,used to be done…,过去常常被……, 故答案选D。
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