---Whydoesthelakesmellterrible?---Becauselargequantiti...

問題詳情：

 ---Why does the lake smell terrible?

--- Because large quantities of water______.

A  is being polluted     B have been polluted    C is polluted   D  has been polluted

【回答】

 B

知識點：主謂一致

題型：選擇題