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
At first _________ it looked like a simple accident, but later the police became suspicious.
A．sight
B．view
C．attempt
D．glimpse
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
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