【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】C

【解析】考查動(dòng)詞時(shí)態(tài)，語態(tài)和主謂語一致。根據(jù)前一分句可知所填動(dòng)詞表示過去發(fā)生的動(dòng)作對(duì)現(xiàn)在產(chǎn)生的影響，時(shí)態(tài)用現(xiàn)在完成時(shí)，動(dòng)詞與主語是被動(dòng)關(guān)系，用被動(dòng)語態(tài)。主語是large quantities of water，其中心詞是quantities，是復(fù)數(shù)，謂語動(dòng)詞用復(fù)數(shù)，選D。

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