单项选择题

Some people think it's ______ to smoke with a cigarette holder.

A．flexible
B．sophisticated
C．versatile
D．productive
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单项选择题
Of the 1, 200 million people who call themselves Chinese, ______ a very small number speak what is referred to as standard Chinese.
A．none but
B．but for
C．all but
D．but then
单项选择题
Attempts to persuade her to stay after she felt insulted were ______.
A．of no avail
B．out of focus
C．at a loss
D．in no way
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