单项选择题

Modern ______ perhaps causes more problems than it solves.

A．technique
B．technology
C．tactics
D．tendency
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单项选择题
He set up in business ______ his own and was very successful.
A．in
B．of
C．on
D．by
单项选择题
A．led upB．ledC．resultedD．caused
A．led up
B．led
C．resulted
D．caused
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