单项选择题

I'm sure these documents will be ______ great value to you.

A．about
B．from
C．with
D．of
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单项选择题
According to the survey, the December ______ of the magazine is the most popular among the readers.
A．copy
B．issue
C．print
D．number
单项选择题
Computer has the power to ______ people around the world to work together.
A．allow
B．let
C．permit
D．agree
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