Every possible means ______ to prevent the air pollution, but the sky is still not clear.
#85598
A
has been used
B
have been used
C
is used
D
are used
推荐题目
Physics ________ my favorite subject. I like it so much that I wish we had a physics class every day.
#85752
A
is
B
are
C
was
D
have been
As I have a meeting at four, ten minutes _____ all that I can spare to talk with you.
#86307
A
are
B
was
C
is
D
were
—My good friend Tom, together with his classmates, going to visit Shenzhen.—Will he phone you as soon as he here?
#43564
A
are; arrives
B
are; will arrive
C
is; arrives
D
is; will arrive
There was a fire last night and more than one house _____ burnt down in the fire.
#85919
A
has been
B
was
C
have been
D
were