Scientists also have no idea how long it will be before all wild animals in the cages _____. 
#99827
A
should be set free
B
will be set free
C
are set free
D
would be set free
推荐题目
Prices ______ all the time. It's no wonder that we've spent so much money recently.
#99666
A
rose
B
had risen
C
were rising
D
have been rising
When he ________ the door,he found his keys were nowhere.
#99503
A
would open
B
opened
C
had opened
D
was to open
 — Tom, will you attend the press meeting to be held this morning? — But I ______ anything about it.
#99852
A
wouldn’t be told
B
haven’t been told
C
haven’t told
D
am not told
Getting to the cinema, quite out of breath, we found the film     for ten minutes. 
#102720
A
having been on
B
had begun
C
had been on
D
had been started