问题
选择题
—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
答案
答案：D
搜题请搜索小程序“爱下问搜题”
—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
答案：D