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---Did you hear that water in Tai Lake smelled terrible?
--- Yes.It ___________ because of people and factories.
A.  polluted     B. was polluted   C.has polluted              

B

解析试题分析: be+动词的过去分词构成被动语态,其过去时为were/was+动词的过去分词。句意:你听说太湖的水闻起来非常糟糕了吗?是的,因为水被人类和工厂污染了。问句是过去时,主语又是it,故选B。
考点:考查被动语态的用法。

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