单项选择题

Though he was almost ninety years old, he was still alive and ______.

A．alert
B．grave
C．elegant
D．persistent
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单项选择题
The club members voted to ______ the ban on smoking.
A．refrain
B．repeal
C．repel
D．reside
单项选择题
They had their electricity ______ because they didn't pay the bill.
A．cut in
B．cut off
C．cut down
D．cut out
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