单项选择题

My father is so deaf that he has to use a heating ______.

A．help
B．aid
C．support
D．tool
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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
单项选择题
A．led upB．ledC．resultedD．caused
A．led up
B．led
C．resulted
D．caused
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