Every possible means ________ to prevent the air pollution，but the sky is still not very clear.
#85546
A
were using
B
have used
C
has been used
D
was used
推荐题目
Don't miss the meeting. The questions to be discussed at it _____ of great importance.
#86154
A
is
B
are
C
was
D
will
Either Jim or I ____ going to help the farmers with the orange harvest this afternoon.
#86179
A
was
B
am
C
is
D
are
The New York Times ______ a wide circulation in that town and that people each ______ a copy in the subway is a common occurrence.
#85630
A
has; reads
B
have; read
C
has; read
D
have; reads
Only____________ of the food__________ bad. You needn’t throw all away.
#43671
A
two ninth, have gone
B
two ninths, have gone
C
two ninths, has gone
D
two ninth, has been