单项选择题

It is very difficult to give ______ smoking.

A．in
B．up
C．off
D．out
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单项选择题
We were arguing about the financial matter, ______ the telephone rang unexpectedly.
A．as
B．while
C．when
D．as soon as
单项选择题
The French pianist who had been praised very highly ______ to be a great disappointment.
A．turned up
B．turned over
C．turned out
D．turned down
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