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
There was nothing they could do ______
A．but to wait
B．only to wait
C．but wait
D．unless they waited
单项选择题
You may ______ this; I don't want it back.
A．get
B．remain
C．maintain
D．keep
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