----Whydoesthelakesmellterrible? ----Becauselargequant...

问题详情：

 ---- Why does the lake smell terrible?

 ---- Because large quantities of water ____________.

       polluted             B. is being polluted       

      C. have been polluted        D. has been polluted 

【回答】

C

知识点：现在完成时及其被动式

题型：选择题