单项选择题

Most people make such mistakes _______ in their whole life.

A．some time
B．sometime
C．some times
D．sometimes
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Many thousands have benefited _______ the new medical system.
A．on
B．in
C．to
D．from
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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