单项选择题

"What are you busy ______ "
"I am busy ______ the plan for the sports meeting."

A．in... to make
B．about... to make
C．in... making
D．about... making
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单项选择题
Only by reading extensively ______ your horizons.
A．you will widen
B．can you widen
C．you may widen
D．therefore you widen
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