－Why does the river smell terrible?
－Because large quantities of water______．

A．have been polluted B．is being polluted
C．has been polluted D．have polluted

A

解析試題分析：“受到污染”即“被污染”應(yīng)該用被動(dòng)語態(tài)，故排除D選項(xiàng)�！昂铀晃廴尽币呀�(jīng)造成后果，故用現(xiàn)在完成時(shí)，所以排除B選項(xiàng)。large quantities of water中是large quantities作主語，故謂語動(dòng)詞用復(fù)數(shù)形式。選項(xiàng)A 正確。句意：——這條河的河水為什么發(fā)臭��？——因?yàn)榇罅康暮铀晃廴玖恕?br />考點(diǎn)：動(dòng)詞的時(shí)態(tài)和語態(tài)和主謂一致

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