单项选择题

I usually buy ______ newspaper on my way to work.

A．an
B．a
C．the
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单项选择题
A bridge was built ______ the river.
A．on
B．at
C．over
单项选择题
By the end of ______ century (世纪，百年), computers may be seen in every home.
A．twenty-first
B．twenty-second
C．twentieth-one
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