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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单项选择题
It is certain that he will ______ his business to his son when he gets old.
A．take over
B．think over
C．hand over
D．go over
单项选择题
The president spoke at the business meeting for nearly an hour without ______ his notes.
A．bringing up
B．referring to
C．looking for
D．trying on
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