单项选择题

I was impressed ______ the efficiency of the work done in the company.

A．in
B．about
C．with
D．for
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单项选择题
Many people are asking whether traditional research universities in fact have any future ______.
A．at all
B．so far
C．in all
D．on end
单项选择题
The native Canadians lived in ______ with nature, for they respected nature as a provider of life.
A．coordination
B．acquaintance
C．contact
D．harmony
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