问题
选择题
--Why does the lake smell terrible?
-- Because a large amount of water_______.
A.have polluted
B.is being polluted
C.has been polluted
D.have been polluted
答案
C
题目分析:句意:--为什么这个湖这么难闻?--因为很多水已经被污染了。a large amount of+不可数名词做主语的时候,谓语是单数,如果是large amounts of+不可数名词做主语的时候,谓语是复数,所以排除AD,而且从Why does the lake smell terrible?可知这个湖已经被污染了,所以选C。