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
The news _____ the spaceship succeeded in returning to the earth spread everywhere.
#29945
A
that
B
which
C
whether
D
what
It was ______ he said ______ disappointed me.
#34339
A
that; what
B
that; that
C
what; that
D
what; that
Was it because of the heavy snowstorm in Europe the flight had to be put off?
#32608
A
which
B
so
C
why
D
that
Please keep the windows closed _____________ it rains.
#31827
A
in case of
B
in that case
C
in no case
D
in case
It is estimated that nearly 100 million people live here, most of ______ in the west.
#34490
A
which
B
whom
C
that
D
them