单项选择题

He was employed as an interpreter because he was ______ in three languages.

A．intimate
B．proficient
C．efficient
D．sufficient
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Sit ______ you like.
A．however
B．wherever
C．but
D．but where
单项选择题
Smoking is a very bad habit, which many people find difficult to ______.
A．break
B．beat
C．breathe
D．cough
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