题目内容

---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】

试题分析：考查时态。句意：--那片湖水怎么那么难闻？--因为大量的水都被污染了。发生在过去的事情，对现在造成的影响，用现在完成时，排除B；large quantities of大量的，后加可数名词复数或不可数名词，谓语用复数形式，排除C；water和pollute之间是被动关系，应该使用现在完成时的被动形式，故选D。

考点：考查时态

 

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