单项选择题

This fever will return from time to time, if it follows its usual ______.

A．pattern
B．model
C．mode
D．norm
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单项选择题
A knowledge of classical music is ______ to anyone who wants to apply for this job.
A．invariable
B．indispensable
C．invaluable
D．innumerable
单项选择题
Dr. Johnson ______ the task of writing a comprehensive English dictionary.
A．underwent
B．undertook
C．recreated
D．awarded
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