单项选择题

By the sixth century AD, when few Europeans could read, the Chinese ______ paper.

A．invented
B．had invented
C．have invented
D．had been invented
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I hope you don't mind me ______ you sir, but is there much money involved in the will
A．asking
B．to ask
C．ask
D．that I ask
单项选择题
You will never guess whom I ______ on the street yesterday.
A．ran over
B．ran out of
C．ran into
D．ran up to
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