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
The news of the air crash is not yet ______ by the government.
A．committed
B．confirmed
C．considered
D．concerned
单项选择题
Our slogan is Quantity should never be increased at the ______ of quality .
A．price
B．cost
C．value
D．wealth
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