----Why does the lake smell terrible? ----Because large quantities of water_______? [ ]A. have polluted B. is being polluted C. has been pollutedD. have be-高中英语-魔方格

◎ 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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◎ 解析

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◎ 知识点

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