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

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

出自：四川农业大学大学英语

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