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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单项选择题
As the word was repeated over and over again, it began to ______ a new meaning.
A．put on
B．turn on
C．take on
D．bring on
单项选择题
That battle is of great significance when viewed in the ______ of the progress of the war.
A．view
B．perspective
C．opinion
D．idea
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