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
---Our family    to Taiwan Island this coming holiday.---Have a great time!
#101801
A
have traveled
B
went traveling
C
are traveling
D
would travel
.The moment I arrived there, I found all the food supplies had ______.
#103784
A
used up
B
ran out of
C
given out
D
given away
The poor old man with his two daughters ___ in the street.
#104017
A
was seen to beg
B
were seen to beg
C
was seen begged
D
were seen begging