Bad habits, _______ formed, are difficult, and sometimes impossible to shake off.
#31345
A
before
B
once
C
until
D
unless
推荐题目
--The plane is due to take off at 7∶50 from the airport. --________ we fail to arrive there in time?
#33063
A
What if
B
As if
C
Even if
D
Only if
We need some more facts and figures ______ we make the final decision.
#30185
A
since
B
before
C
after
D
until
_______ it is so hot, I guess we can’t do anything until after dark.
#32716
A
In case
B
Now that
C
Even if
D
As though
_______ many people first go to the Internet for information, it is not always the best place for what you need.
#33612
A
As
B
Since
C
When
D
While