单项选择题

I don' t understand why you ______ the same mistakes.

A．keep to make
B．keeping to make
C．keep on make
D．keep on making
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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
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
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