单项选择题

This gold mine was discovered by accident.

A. by air
B. by chance
C. at large
D. at ease
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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
单项选择题
They are still calculating the impact of automation on the lives of factory workers.
A. affect
B. influence
C. pressure
D. passion
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