----Whydoesthelakesmellterrible?----Becauselargequantit...

问题详情：

---- 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

【回答】

D

知识点：现在完成时及其被动式

题型：选择题