单项选择题

Professor Bill had begun taking _____________ research work when he was in high school.

A．to do
B．doing
C．to doing
D．having done
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单项选择题
I'm not particular _____________ my clothes; I don't mind what I wear.
A．about
B．for
C．of
D．to
单项选择题
Robert seemed to be _____________ of deciding anything for himself.
A．incompetent
B．ineffective
C．unable
D．incapable
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