Question

—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

 

Answer 1

D

【解析】主语是large quantities of water，其中心词是quantities(复数)，不管其后的名词是否可数，谓语动词都用复数(比较：a large quantity of water＋单数谓语)，又water与pollute之间是动宾关系，故用被动语态。