问题

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
B:is being polluted
C:has been polluted
D:have been polluted
正确答案是:
同类题型
Thinking that the students were having anevening class, the teacher left the classroom, ______.
Excuse me. Is this ________ dictionary — No. That one belongs to ________.
_______ I read English loudly in themorning, I would start from today on.
Every now and then Iget hungry for Chinese food. Let’s dine out tonight.—Forget it. Mymoney_______.