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题目内容
（四川农业大学大学英语）
6.-Why does the stream smell terrible?
Because large quantities of water_____
A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted
Because large quantities of water_____
A. have polluted
B. is being polluted
C. has been polluted
D. have been polluted
参考答案