单项选择题

Although Kerry has had no formal education, he is one of the ______ businessmen in the company.

A．alertest
B．sternest
C．nastiest
D．shrewdest
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单项选择题
This university offers a wide variety of high-quality ______ courses for both graduate and undergraduate students.
A．select
B．choice
C．alternative
D．optional
单项选择题
There are still some ______ for students of science and engineering, but those in arts and humanities have been filled.
A．positions
B．vacancies
C．applications
D．categories
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