单项选择题

______ entering the hall, he found everyone watching him.

A．At
B．While
C．On
D．In
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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
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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