单项选择题

The boxer ______ his opponent as hard as he could.

A．punched
B．whipped
C．slapped
D．knocked
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单项选择题
They decided to ______ their different interests and unite in pursuit of a common goal.
A．substitute
B．cross
C．submerge
D．surrender
单项选择题
In manufacturing, cheaper materials are constantly being ______ for the better and more expensive kind.
A．replaced
B．transformed
C．displaced
D．substituted
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