单项选择题

As soon as we crossed the border, enemy troops started firing at our troops.

A. shooting
B. fighting
C. striking
D. hitting
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They are still calculating the impact of automation on the lives of factory workers.
A. affect
B. influence
C. pressure
D. passion
单项选择题
As a manager, I should know more about the hotel trade.
A. business
B. industry
C. export
D. training
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