单项选择题

I planned to go by air, but______ second thoughts, I decided to travel by train.

A．for
B．on
C．at
D．by
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单项选择题
The car accident was______ to the driver's violation of the traffic regulations.
A．assigned
B．contributed
C．attributed
D．transferred
单项选择题
The work is not very profitable______ cash, but he is getting valuable experience from it.
A．in words of
B．in terms of
C．on terms of
D．on words of
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