问题
选择题
—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
答案
答案：D
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—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
答案：D