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she __ (study) art in a school when i began to work in the f

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she __ (study) art in a school when i began to work in the factory.was studying
为何不可用had studied?
she __ (study) art in a school when i began to work in the f
这里的意思是:当我开始工作时她正在学艺术,主要强调的是某个时候某个人正在做的事
我开始工作是一个短暂的时间,不能用完成时.完成时后接一段时间