单项选择题

From time to time we must look up words ______.

A．the meanings of those we do not know
B．whose meanings we are not familiar
C．that we do not know their meanings
D．whose meanings we do not know
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单项选择题
Janet has learned to drive, but she's like to have ______.
A．the own car
B．the car of her own
C．an own car
D．a car of her own
单项选择题
Most children do not become permanently right- or left-handed ______ they are five or six years old.
A．since
B．until
C．as long as
D．once
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