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