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問題詳情:

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

 ---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