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
When I heard the sad news I couldn't help ______.
A．crying
B．cry
C．to cry
D．being cry
单项选择题
George said that he ______.
A．arrived in the station by noon
B．should arrive in the' station till noon
C．was to arrive at the station till noon
D．would arrive at the station by noon
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