单项选择题

Before the tourists set off, they spent much time setting a limit ________ the expenses of the trip.

A．for
B．in
C．to
D．about
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单项选择题
As I regard it, you can widen the ________ of these improvements through your active participation.
A．volume
B．dimension
C．magnitude
D．scope
单项选择题
To drive a car safely, it is ________ good brakes.
A．essential with
B．essential having
C．essential to have
D．essential have
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