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

問題詳情：

---- 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

知識點：現在完成時及其被動式

題型：選擇題