My father used to work in an American factory for three years.
My father had been used to work in a factory in the United States for three years
As soon as joy's father left,he turned on the tv.
My father used to work in a factory where located in American for three years.
Joe turns on the TV as soon as his father left.
①My father used to work at a factory in America for three years. ②As soon as Joe's father left,joe turned on the TV.
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