单项选择题

In order to proceed we must agree ______ a plan of action.

A．with
B．on
C．to
D．in
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单项选择题
When you write a composition, would you please leave enough ______ for correction
A．edge
B．margin
C．border
D．limit
单项选择题
Many a teacher in our department ______ abroad.
A．have been
B．has been
C．have go
D．has go
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