题目内容
5、Every possible means _______to prevent the air pollution, but the sky is still not clear.
A. are being used B. have been used C. has been used D. had been used
试题答案
5、C
Every possible means ______ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
查看习题详情和答案>>Every possible means ______ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
查看习题详情和答案>>Every possible means ___ to prevent the air pollution, but the sky is still not clear．
| A．is used | B．are used | C．has been used | D．have been used |
Every possible means _____ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
查看习题详情和答案>>
Every possible means ___ to prevent the air pollution, but the sky is still not clear．
A．is used B．are used C．has been used D．have been used
查看习题详情和答案>>
Every possible means _______to prevent the air pollution, but the sky is still not clear.
A. are being used B. have been used C. has been used D. had been used
查看习题详情和答案>>
Every possible means ________ to prevent the air pollution, but the sky is still not clear.
A. is used B. are used C. has been used D. have been used
查看习题详情和答案>>
7、Every possible means ______ to prevent the air pollution, but the sky is still not clear.
|
A．is used |
B．are used |
C．has been used |
D．have been used |
查看习题详情和答案>>