单项选择（每题1分）We must think twice _____ we make the final decision.
#34457
A
when
B
while
C
until
D
before
推荐题目
A man with a big camera in his hands stopped me and asked, “Excuse me! Is there a post office around ______ I can have these posters sent to my friends?”
#31613
A
that
B
which
C
where
D
what
The Frenchman speaks ______.
#80381
A
French as well as Chinese
B
Chinese as well as French language
C
Chinese as well as French
D
the French language as well as Chinese.
The shocking news made me realize ________ terrible problems we would face.(2011·北京)
#30463
A
what
B
how
C
that
D
why
You may use the room as you like ________ you clean it up afterwards.
#32261
A
as far as
B
so long as
C
in case
D
even if