—Whydoestheriversmellterrible?—Becauselargequantitiesof...
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问题详情:
—Why does the river smell terrible?
—Because large quantities of water ________.
A.have polluted B.is being polluted
C.has been polluted D.have been polluted
【回答】
D
知识点:现在完成时及其被动式
题型:选择题
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