—Why does the lake smell terrible? —Beca

问题选择题

—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

答案

答案：D

由语境可知水已经被污染了，要用现在完成时，排除B项；large quantities of...作主语时，谓语动词要用复数形式，排除C项；water与pollute之间存在动宾关系，故此处应用被动语态，排除A项。