单项选择题

Since the airport is closed this morning, it must ______ last night.

A．snow
B．have snowed
C．have been snowed
D．have being snowed
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单项选择题
It is impossible to make an early ______ to have my hair cut tomorrow.
A．employment
B．engagement
C．appointment
D．arrangement
单项选择题
The police was completely ______ by the thief' s disguise.
A．taken back
B．taken on
C．taken in
D．taken down
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