---Whydoesthelakesmellterrible?---Becauselargequantitie...
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问题详情:
--- Why does the lake smell terrible?
---Because large quantities of water .
A.have polluted B.is being polluted
C.have been polluted D.has been polluted
【回答】
C
知识点:动词时态与语态
题型:选择题
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