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
The ______ crown jewels are kept in the Tower of London.
A．valued
B．valueless
C．invaluable
D．usable
单项选择题
He ought to attend the meeting, ______
A．should he
B．ought he
C．shouldn’t he
D．oughtn’t he
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