单项选择题

When Mr. Green retired, his son ______ the business.

A．took up
B．took on
C．took over
D．took out
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单项选择题
______ in Beijing for quite a few years, Mr. Park had little difficulty understanding Chinese.
A．Having lived
B．Lived
C．Living
D．To live
单项选择题
We ______ you came to visit our lab tomorrow.
A．had better
B．rather than
C．would rather
D．will rather
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