Question

-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

Answer 1

D

考查動(dòng)詞時(shí)態(tài)，語(yǔ)態(tài)和主謂語(yǔ)一致。根據(jù)前一分句可知所填動(dòng)詞表示過(guò)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(yǔ)是被動(dòng)關(guān)系，用被動(dòng)語(yǔ)態(tài)。主語(yǔ)是large quantities of water，其中心詞是quantities，是復(fù)數(shù)，謂語(yǔ)動(dòng)詞用復(fù)數(shù)，選D。