单项选择题

The railway system was _________ on the successful plan used in other countries.

A．copied
B．imitated
C．modeled
D．molded
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单项选择题
The competition among producers of personal computers is _________ a race to get the best.
A．effectively
B．necessarily
C．essentially
D．remarkably
单项选择题
The company has retrained its employees to emphasize service and is boasting about the re suits in an ad _________.
A．movement
B．battle
C．operation
D．campaign
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