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
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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
单项选择题
There was nothing they could do ______.
A．but to wait
B．only to wait
C．but wait
D．unless they waited
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