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
 —Do you like traveling? —Sure. I _____ to Australia six months ago, but I _____ anywhere since then.
#102982
A
went; didn’t go
B
have gone; haven’t been
C
went; haven’t been
D
went; hadn’t been
Unless the police can prove to the court that Ted has committed robbery,he______.
#104367
A
will not find guilty
B
will not be found guilty
C
will have found guilty
D
will not have found guilty
—I say, Harry. What did you say to the laid-off worker just now? —Nothing. I           to myself.
#102852
A
had only talked
B
am only talking
C
have just talked
D
was just talking