---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

試題分析： be+動詞的過去分詞構(gòu)成被動語態(tài)，其過去時為were/was+動詞的過去分詞。句意：你聽說太湖的水聞起來非常糟糕了嗎？是的，因為水被人類和工廠污染了。問句是過去時，主語又是it，故選B。
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