单项选择题

Operations which left patients ______ and in need of long periods of discovery time now leave them feeling relaxed and comfortable.

A．exhausted
B．unhealthy
C．upset
D．fearful
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单项选择题
My father is so deaf that he has to use a heating ______.
A．help
B．aid
C．support
D．tool
单项选择题
He set up in business ______ his own and was very successful.
A．in
B．of
C．on
D．by
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