单项选择题

You must ______ at the airport an hour before your plane leaves.

A．check in
B．check out
C．check up
D．check on
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单项选择题
If you cheat in the exam, you will be found out
A．more or less
B．sooner or later
C．by and large
D．over and over
单项选择题
A．appliesB．preparesC．votesD．compensates
A．applies
B．prepares
C．votes
D．compensates
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