单项选择题

The rest of his life is ______ to the cause of international exchange of visiting scholars.

A．added
B．put
C．saved
D．committed
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单项选择题
He refused to sell his painting at the low ______ offered.
A．figure
B．number
C．expense
D．money
单项选择题
He ______ two hours ______ to meet his sister at the airport.
A．took...over
B．took...off
C．took...apart
D．took... up
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