We laugh at jokes,but seldom____________about how they work.
#83338
A
we think
B
think we
C
we do think
D
do we think
推荐题目
  At no point south of the Han River _______ more than a mile. 
#83969
A
the enemy didn’t advance
B
the enemy advanced
C
did the enemy advance  
D
didn’t
Their performance was much better than_________.
#82579
A
expected
B
it expected
C
expecting
D
it is expected
The achievements of the greatest minds in science could never have been reached________ the patient work of hundreds of others.
#83215
A
were it not for
B
had it not been because
C
had it not been for
D
if it had not been