单项选择题

With prices ______so much, it is difficult for the school to plan a budget.

A．vibrating
B．swinging
C．fluctuating
D．fluttering
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单项选择题
Your advice would be ______valuable to him, who is now at a loss to what to do first.
A．exceedingly
B．excessively
C．extensively
D．exclusively
单项选择题
Astronauts are ______ all kinds of tests before they are actually sent up in a spacecraft.
A．inclined to
B．subjected to
C．prone to
D．bound to
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