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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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
单项选择题
Maria has blisters in her boots. She ______ walking such a long distance.
A．was used not to
B．used to
C．is not used to
D．did not used to
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