- Why does the lake smell terrible? - Because large quantities of water________ .[ ]A. have pollutedB. is being pollutedC. has been pollutedD. have been po-高中英语-n多题

◎ 题干

- 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

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◎ 知识点

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