—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
网友回答
A. have polluted
B. is being polluted
(答案→)C. has been polluted
D. have been polluted
解析：情景对话 句意为：--这片湖闻着咋这么难闻呢？
--因为大片的水都被污染了
从语态上讲，动词有主动和被动之分；如果主语和谓语动词之间是主动关系，则为主动语态，反之，则为被动语态。根据答语，主语为water，谓语为pollute，显然为被动关系，可排除A.从时态角度讲，此题涉及进行时和完成时，根据答语可知，水被污染这件事造成了湖被污染，产生了影响，这是现在完成时的用法。据此，可排除B.从主语和谓语一致关系看，通常情况下，不可数名词后跟单数谓语，不过前面有large quantities of修饰时，谓语需要复数形式，推出答案D