单项选择题

______ does Mary write to her father Twice a week.

A．How long
B．How often
C．How far
D．How soon
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His uncle can ______ only 185 Yuan ______ the coat at the most.
A．spend; for
B．spent; on
C．pay; on
D．pay; for
单项选择题
I have made ______ clear ______ I have nothing to do with the accident.
A．it... who
B．it... that
C．this... who
D．this... that
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