Every possible means _____ to prevent the air pollution, but the sky is still not clear.
#85634
A
is used
B
are used
C
has been used
D
have been used
推荐题目
American President Obama, together with some members of his government, _____ going to visit China next month.
#86040
A
is
B
are
C
were
D
was
(2014·湖南省部分重点中学3月联考)Many a student________selected to take part in the English competition，and more than one teacher________them on speaking and writing.
#85545
A
was；has coached
B
were；have coached
C
was；have coached
D
were；has coached
Nobody ______ seen the film. It’s a pity.
#86064
A
but Tom and Jack have
B
except Tom and Jack have
C
but my friends has
D
but I have