-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

D


解析:

考查動詞時態(tài),語態(tài)和主謂語一致。根據(jù)前一分句可知所填動詞表示過去發(fā)生的動作對現(xiàn)在產(chǎn)生的影響,時態(tài)用現(xiàn)在完成時,動詞與主語是被動關(guān)系,用被動語態(tài)。主語是large quantities of water,其中心詞是quantities,是復數(shù),謂語動詞用復數(shù),選D。

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