问题
选择题
—Why does the river smell terrible?
—Because large quantities of water__________．
A．have polluted
B．is being polluted
C．has been polluted
D．have been polluted
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—Why does the river smell terrible?
—Because large quantities of water__________．
A．have polluted
B．is being polluted
C．has been polluted
D．have been polluted
答案：D