单项选择题

A．In a parking lot.
B．In an emergency room.
C．On a hill.
D．At a service station.
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单项选择题
A．By the next day.B．On the hour.C．Within an hour.D．Before six.
A．By the next day.
B．On the hour.
C．Within an hour.
D．Before six.
填空题
find out the value of an hour of their time。
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