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时间状语从句as,while,when怎么区别

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时间状语从句as,while,when怎么区别
____ (As) they were enjoying exploring,the crowd of people became larger and larger.
 第一题为什么用as,不用while / when?
_______(While / When)the crowd was pushing Darren in all directions,someone stepped on his feet.
 第二题为什么可以用while/when,但是不能用as?
_______(When)  Darren finally pushed his way out,he couldn't find his two friends.
什么用when?为什么不用as?
 
请针对我提出的三个具体问题给出答案,而不是复制、粘贴一些语法的解释,
时间状语从句as,while,when怎么区别
第一题,as,when都可以引导原因状语从句,而while不可以,表示原因时,as表示“因为”,而when表示”既然“,显然既然在这里说不通,as为最佳答案.
第二题,as引导时间状语从句时,强调主从句的动作同时发生,强调两个动作同时进行.
when和while就没有这个限制了.