单项选择题

The idea sounds very good but will it work in_________

A．practice
B．place
C．advance
D．company
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——_________does Mr. Johnson go to London on business ——At least once a month.
A．How many
B．How long
C．How often
D．How
单项选择题
The Internet has brought______ big changes in the way we work.
A．about
B．out
C．back
D．up
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