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
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
单项选择题
With oil prices keeping______, people are hesitating whether to buy a car or not.
A．rising
B．arising
C．raising
D．arousing
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