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
—Whydoestheriversmellterrible?—Becauselargequantitiesof...
智谷库
人气：2.46W
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