It is well known to us all that a lot of rivers _______by factories.
#102816
A
are polluting
B
have been polluting
C
are being polluting
D
are being polluted
推荐题目
--- Each of the students, working hard at their lessons, ______ the book. --- So have I.
#104090
A
is reading
B
has read
C
reading
D
reads
—By the way，have you moved into the new house?—Not yet．The walls ________．
#99379
A
were painted
B
are being painted
C
are painted
D
are painting
-Have you seen the film? --Yes. I _______ it three times when I was in Tokyo.
#104184
A
saw
B
had seen
C
have seen
D
was seeing
His sister left home in 1998，and ________ since.
#99572
A
had not been heard of
B
has not been heard of
C
had not heard of
D
has not heard of
—Did you ask your elder brother for help?—I need to. I managed it by myself.
#101178
A
don't
B
wouldn't
C
didn't
D
won't