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
The speaker doesn't know when to stop. There's ______ worse than that.
A．anything
B．nothing
C．everything
单项选择题
One day while I ______ along the street, I ______ someone calling.
A．walked ;was hearing
B．was walking; has heard
C．was walking; heard
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