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
I have a tight budget for the trip, so I'm not going to fly _ the airlines lower ticket prices.
#31637
A
once
B
if
C
after
D
unless
He was told that it would be at least three months ___ he could recover and return to work.
#79972
A
when
B
before
C
since
D
that
._____ you arrive in Ireland, you will quickly find yourself on the beautiful country roads.
#34519
A
Since
B
While
C
Once
D
Until
---How long has your brother been working in this factory? ---_____he dropped from school in 2010.
#30727
A
When
B
Until
C
Since
D
Before