题目:
-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
-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