—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.-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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◎ 解析

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◎ 知识点

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