The boss in this factory made the wordkers work for 12 hours a day in the past．（改为被动语态）
The workers in this factory made work for 12 hours a day in the past．
The boss in this factory made the wordkers work for 12 hours a day in the past．（改为被动语态）
The workers in this factory made work for 12 hours a day in the past．
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