单项选择题

The students were just about to ______ the question, when suddenly he found the answer.

A．arrive at
B．submit to
C．work on
D．give up
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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
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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