单项选择题

Their hesitation means ______ the experiment.

A．to give up doing
B．to give up to do
C．to be given up to do
D．giving up doing
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单项选择题
During the ______ the audience strolled and chatted in the lounge.
A．gap
B．pause
C．space
D．interval
单项选择题
The police were given an order that the stolen documents must be recovered at all ______.
A．accounts
B．conditions
C．payments
D．costs
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