单项选择题

A bridge was built ______ the river.

A． on
B． at
C． over
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单项选择题
Each one of us ______ a nice pencil-box.
A． have
B． has
C． is having
单项选择题
As winter comes, the weather is getting ______ .
A． cold and cold
B． cold and colder
C． colder and colder
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