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
You should be __________ when you cross the street.
#39147
A
quiet
B
easy
C
careful
D
hard
Soon she __________ swim a quarter of a mile.
#43028
A
can
B
could
C
is able to
D
will be able to