单项选择题

He knows ______ English now.

A．a few
B．a little
C．quite a few
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Macao returned to our motherland ______ December 20th 1999.
A．on
B．at
C．in
单项选择题
Three years ______ a short time. You have to study hard.
A．is
B．are
C．be
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