Throughout the history of science there have been periods wh

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Throughout the history of science there have been periods when revolutionary thinkers questioned traditional assumptions and outdated theories.
还有一个答案是of when revolutionary thinkers…………
这两个有什么区别呢

先行词是periods,在此句中表示一段时间,从句部分“改革思想家们质疑了传统的假想和过时的理论”,不缺任何成分,那么根据句意和结构,定语从句中缺时间状语,因此用when.这里的when可以替换成in(during) which.
when是关系副词,前面是不能加介词的,只有关系代词,如which,前面才可以有介词.

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