单项选择题

Could I change my pounds ______dollars, please I'm off to the USA shortly.

A． from
B． against
C．for
D．by
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单项选择题
We would greatly____ any advice you may care to give.
A．estimate
B．appraise
C． appreciate
D．evaluate
单项选择题
All flights_______ because of the snowstorm, many passengers could do nothing but take the train.
A．had been cancelled
B．having been cancelled
C．were cancelled
D．have been cancelled
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