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
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单项选择题
He was praised for ______ a great contribution to his county.
A．have made
B．being made
C．be made
D．having made
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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