---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】

試題分析：考查時態(tài)。句意：--那片湖水怎么那么難聞？--因為大量的水都被污染了。發(fā)生在過去的事情，對現(xiàn)在造成的影響，用現(xiàn)在完成時，排除B；large quantities of大量的，后加可數(shù)名詞復(fù)數(shù)或不可數(shù)名詞，謂語用復(fù)數(shù)形式，排除C；water和pollute之間是被動關(guān)系，應(yīng)該使用現(xiàn)在完成時的被動形式，故選D。

考點：考查時態(tài)

 

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