问题
选择题
---- Why does the river smell terrible?
---- Because large quantities of water______．
A．have been polluted
B．has polluted
C．has been polluted
D．have polluted
答案
A
题目分析： 考查动词的时态与语态。句意 为什么这条河流的味道那么难闻？因为大量的水被污染掉了。Large quantities of +名词 做主语是谓语动词用复数形式，水与污染之间是被动关系，结合以上两点，故选A项。
考点 : 考查动词的时态与语态