单项选择题

One of the main characteristics of the good language learner is the high ____________ in study.

A．proficiency
B．efficiency
C．sufficiency
D．deficiency
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单项选择题
The reporter wanted to ____________ a long report into a brief summary.
A．squeeze
B．contract
C．condense
D．shrink
单项选择题
In the preface ____________ my book, I thanked all the people who had been of help to me.
A．of
B．to
C．in
D．for
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