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
It was many years ____ American women were given the rights to vote.
#81514
A
when
B
since
C
before
D
as
At no point south of the Han River _______ more than a mile.
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A
the enemy didn’t advance
B
the enemy advanced
C
did the enemy advance
D
didn’t
Their performance was much better than_________.
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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
When first ________ to the market, the computer software ． was not a success due to its complexity in operation.
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A
introducing
B
being introduced
C
introduced
D
to be introduced