单项选择题

He ______ reading silently at first.

A．used not to
B．didn' t use to
C．was not used to
D．is not used
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单项选择题
When Mr. Black retired, his son______the business.
A．took up
B．took over
C．took on
D．took out
单项选择题
Words ______ meaning, as we ail know.
A．convince
B．convey
C．contribute
D．conquer
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