单项选择题

Many thousands have benefited ______ the new medical system.

A．on
B．in
C．to
D．from
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单项选择题
I'm trying to be more ______ when I go shopping, and only buying what I really need.
A．economy
B．economic
C．economical
D．economics
单项选择题
The company isn't _______ doing such big business.
A．able to
B．capable to
C．able of
D．capable of
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