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
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
单项选择题
About ______ of the students in the college are from foreign countries.
A．two-third
B．two-thirds
C．second-three
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