three years has passed____ he knew this 是before还是when

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three years has passed____ he knew this 是before还是when
three years has passed____ he knew this 是before还是when

three years has passed____ he knew this 是before还是when
before

before

before。这里要注意的是,题目中出现的three years是一个时间段,而when 引导的时间状语常常表示的是一个时间点。