问题
选择题
— Why does the lake smell terrible?
— Because large quantities of water _________.[ ]
A. have been polluted
B. has polluted
C. have polluted
D. has been polluted
答案
答案：A
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— Why does the lake smell terrible?
— Because large quantities of water _________.[ ]
A. have been polluted
B. has polluted
C. have polluted
D. has been polluted
答案：A