单项选择题

The cost of the air fare is higher than__________.

A．the rail fare
B．that of the rail fare
C．those of the rail fare
D．which of the rail fare
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单项选择题
The speed __________is 340 meters per second.
A．at which sound travels
B．with which sound travels
C．of which sound travels
D．for which sound travels
单项选择题
This is one of__________ beautiful places in this city.
A．most of the
B．most of
C．the most
D．most
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