As the sea ice melts sooner each swimmer,polar bears are forced to come ashore earlier and face food shortages _____ they have stored enough fat to last them through the season.
#31875
A
before
B
unless
C
since
D
until
推荐题目
you can borrow my car you promise not to drive too fast.
#30774
A
unless
B
even if
C
in case
D
as long as
Our class discussed the question of __________it is necessary for us students to use mobile phones on campus.
#31888
A
if
B
where
C
whether
D
that
Tom has two cousins, and ______ are engineers.
#31634
A
both of whom
B
both of them
C
none of them
D
either of them
He was about to tell me the secret_____ someone patted him on the shoulder.
#79907
A
as
B
until
C
while
D
when