－Why does the river smell terrible?－Because large quantities of water______．
#100039
A
have been polluted
B
is being polluted
C
has been polluted
D
have polluted
推荐题目
If Joe knew anything about car mechanics, I’m sure he would help us fix the car, but he ______ even less than we do.
#100899
A
had known
B
would know
C
knew
D
knows
—I don’t understand why you didn’t go to the lecture yesterday afternoon.—I’m so sorry.But I________my homework. (2013·湖南，34)
#99429
A
had done
B
was doing
C
would do
D
am doing
---Where you put my dictionary?---I left it on your desk when you to Tom.
#101371
A
did; spoke
B
have; were speaking
C
had; were speaking
D
had; spoke
–Have you handed in your schoolwork yet? --Yes, I have. I guess it ________ now.
#99519
A
has graded
B
is graded
C
is being graded
D
is grading