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
---Are you __________ to go on a trip to Taiwan?---Yes. But I don’t have ___________.
#43843
A
free enough, enough money
B
enough free, enough money
C
free enough, money enough
D
enough free, money enough
Professor Smith，along with his assistants， on the project day and night to meet the deadline.
#86243
A
work
B
working
C
is working
D
are working
Tom is the only one of the students in our school who_____late this morning.
#86279
A
were
B
was
C
have been
D
are