单项选择题

They had an accident on the road and didn't ____ at their hotel until after midnight.

A．show off
B．check in
C．check out
D．drop out
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单项选择题
These national parks are very important for preserving many animals, who would ____ run the risk of becoming extinct.
A．otherwise
B．nevertheless
C．therefore
D．instead
单项选择题
All that can be done ____.
A．have been done
B．have done
C．has done
D．has been done
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