—Why does the lake smell terrible? —Because large quantities of water ________.[ ]A. have pollutedB. is being pollutedC. has been pollutedD. have been poll-高中英语-n多题

◎ 题干

—Why does the lake smell terrible?
—Because large quantities of water ________.

[ ]

A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted

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