—This wall of air is an effective answer to the problem  and it ____ work.  —But it is a question to put such a wall of air around the statue. 
#89204
A
may
B
must
C
should
D
could
推荐题目
---Did you visit the famous museum ?  ---No. We ______ it. But we spent too much time shopping. 
#89472
A
can't have visited
B
could have visited
C
must have visited
D
shouldn't have visited
If you ________ yesterday,you ________ with your mother now.
#87090
A
set off; would talk
B
had set off; would be talking
C
set off; would have talked
D
had set off; would talk
What if you _____ to send an essay with your application? Would you have been rejected?
#86809
A
forget
B
would forget
C
had forgotten
D
should forget