单项选择题

You can borrow three books ______.
______ , or even more.

A．at the time
B．at a time
C．in one time
D．at time
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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
单项选择题
A ______ achievement of electronics is the electronic computer.
A．widely knowing
B．being widely known
C．widely known
D．having widely known
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