单项选择题

I must have hung ______ for ten minutes before the telephone operator put me through.

A．up
B．round
C．on
D．over
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单项选择题
We always lay in a large ______ of tinned food in winter in case we are snowed up.
A．proportion
B．storage
C．provision
D．supply
单项选择题
They have ______ the price of the coat from $ 50 to $ 25.
A．decreased
B．lessened
C．reduced
D．diminished
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