单项选择题

While in bed the doctor was telephoned to go back to the hospital because of ______ case.

A．a treatment
B．an operation
C．an incident
D．an emergency
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单项选择题
Before the tourists set off, they spent much time setting a limit ______ the expenses of the trip.
A．for
B．in
C．to
D．about
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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