You will not be allowed to get into the plane_______ you pass security checks(安检).
#37307
A
if
B
unless
C
or
D
because
推荐题目
The math problem is _____ difficult that only _____ students can work it out.
#42449
A
too; a few
B
so; a few
C
so; a little
D
enough; little
Let’s go and play _____ ping pong. I don’t want to play ____piano.
#40634
A
a…the
B
the…a
C
/…the
D
the…the