状语从句 Several weeks had gone by _____ I realized the painting was missing.中间的空为什么用before 而不用when?

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状语从句 Several weeks had gone by _____ I realized the painting was missing.
中间的空为什么用before 而不用when?

before 是在..之前,所以主句用的是过去完成时,从句用一般过去时
可翻译为：“数周过去后我才意识到这幅画丢了.”
when 是当...时 应用相同时态吧

两个都可以啊，而且用when还多一点呢，反正高中就是这样说的

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