单项选择题

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

A．check out
B．check on
C．cheek in
D．check over
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单项选择题
The taxi was held up on the way to the railway station, otherwise I ______ the train.
A．must catch
B．have caught
C．could have caught
D．ought to catch
单项选择题
The man shot the bird ______ a gun.
A．by
B．in
C．with
D．through
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