—Why does the river smell terrible? —Because large quantities of water__________.A.have pollutedB.is

题目简介

—Why does the river smell terrible? —Because large quantities of water__________.A.have pollutedB.is

题目详情


—Why does the river smell terrible?
—Because large quantities of water__________.
A.have pollutedB.is being pollutedC.has been pollutedD.have been polluted
题型:单选题难度:偏易来源:不详

答案

D

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