—Why does the river 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】

試題分析：考查時(shí)態(tài)。句意：——為什么這條河這么難聞？——因?yàn)榇罅康乃呀?jīng)被污染。根據(jù)語境可知，大量的水已經(jīng)被污染，故用現(xiàn)在完成時(shí)態(tài)的被動(dòng)語態(tài)，故選D。

考點(diǎn)：時(shí)態(tài)

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