Usually pilots need about a decade of experience _______ they can be promoted to captain.
#31003
A
after
B
before
C
then
D
when
推荐题目
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
Your IQ isn’t _____determines whether you will succeed in your future life.
#30369
A
what
B
where
C
that
D
why
The roof began to fall ______ she had time to dash into the room to save her baby.
#33452
A
after
B
as
C
before
D
until
The US army suffered a record 32 suicides in July 2011, the most it began publishing monthly figures in 2009.
#32189
A
since
B
when
C
while
D
though
---You won’t go to Mary’s wedding party, will you?---Yes, ______ invited to.
#33754
A
even if
B
if
C
unless
D
though