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We were swimming in the lake ____suddenly the storm started.

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We were swimming in the lake ____suddenly the storm started.
我想知道为什么不用before而用when,我要一个合理的解释啊!最好能让我懂的
We were swimming in the lake ____suddenly the storm started.
when 当这时讲,翻译:我们正在湖里游泳,这时突然暴风雨来了.
如果选用before 那么就得翻译为暴风雨来之前,我们在湖里洗澡,这时就不能用swimming了,因为游泳发生在暴风雨之前就得用过去完成时了.
再问: 我比较赞成你说的过去完成时,before+过去时间点,主句就要用过去完成时了!所以肯定排除before了!谢谢你!也谢谢其他好心人!