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【題目】—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

【解析】句意:——這湖水怎么這么難聞？——因為湖里大量的水已經被污染了。water與 pollute為被動關系,故排除A項;B項表示“正被污染”，不符合題意，故排除;large quantities of后加名詞，謂語動詞應用復數形式,故排除C項，答案為D項。

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