---Why does the lake smell terrible?-Because large quantities of water .A. have

问题补充：

------ Why does the lake smell terrible?

------ Because large quantities of water .

A. have been polluted

B. has polluted

C. have polluted

D. has been polluted

答案：

(答案→)A. have been polluted

B. has polluted

C. have polluted

D. has been polluted

解析：考查主谓一致与语态。large quantities of +名词作主语，位于动词用复数；water与pollute构成被动的关系。所以选择A。