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This was a time ( )there are still slaves in the USA.定从when

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This was a time ( )there are still slaves in the USA.定从when ,that用哪个?怎么用?我搞不清啊.
这里应该用when.
最简单的方法是把一句话分成两句,在这里可分为:
This was a time.
There are still slaves in the USA in the time. 请注意,这句话中我用"in the time"取代了原从句中的when,所以括号中需要的是一个时间状语when