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
Our slogan is Quantity should never be increased at the ______ of quality.
A．price
B．cost
C．value
D．wealth
单项选择题
It was not until the accident happened ______ .
A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my own folly
D．that I became aware of my own foolishness
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