【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】試題分析：從問句和答語可知說的是湖的現(xiàn)在的情況，又因?yàn)閺?qiáng)調(diào)污染對湖所產(chǎn)生了一定的結(jié)果和影響，故在C，D中選擇正確答案。由于主語是quantities，謂語動詞要用復(fù)數(shù)。故選D。

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