单项选择题

He handled the company in ______ with his brother.

A．combination
B．mixture
C．collaboration
D．association
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单项选择题
The Brownings have not ______ yet and I doubt whether they will come.
A．turned in
B．turned out
C．turned up
D．turned to
单项选择题
The reporters exposed the corruption of several senior officers in the government; consequently, these officers ______ to resign from office.
A．have asked
B．were asked
C．had asked
D．had been asked
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