单项选择题

It is well known that knowledge is the ______condition for expansion of mind.

A．incompatible
B．incredible
C．indefinite
D．indispensable
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单项选择题
In spring, traffic was often______ along the roads to holiday places.
A．added up
B．built up
C．held up
D．pulled up
单项选择题
If you______ change your mind, please let us know.
A．shall
B．should
C．will
D．would
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