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*He had been a soldier for three years before he came to our city .
*She had learnt 2000 English words before she went to the USA.
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*She left the office before 9 o'clock.
*I finished studying English before midnight.
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*ZhangHong goes before me.
*There are five man before her.
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*The car stops before my house.
*The tall tree stands before our school gate.
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*The car stops in front of my house.
*The tall tree stands in front of our school gate.