单项选择题

Glass-fiber cables can carry hundreds of telephone conversations _____.

A．at length
B．at the moment
C．at the same time
D．at intervals
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单项选择题
The plain silver ring was her favorite; it was _____ to her form her great-grandmother.
A．handed out
B．handed down
C．handed over
D．handed in
单项选择题
On seeing the old lady crossing the road, she _____ her car immediately.
A．pulled up
B．pulled down
C．pulled in
D．pulled off
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