作业帮They were walking along the shore ______a huge
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They were walking along the shore ______a huge
They were walking along the shore ___ when ____ a huge wave appeared out of nowhere,sweeping them out to see.
A when B while C as
为什么B C
They were walking along the shore ___ when ____ a huge wave appeared out of nowhere,sweeping them out to see.
A when B while C as
为什么B C
他们正在海边散步,此时一个巨浪在他们毫无准备的情况下打来.
when,as,while这三个词都可以引出时间状语从句,它们的差别是：
when 的使用范围较广,可表示某时刻、某一时间点、或一段时间,有“当……时”的意思；
while 只表示一段持续的时间,不表示具体的时间点.（本句中显然是点时间,所以不能用）
as 从句表示进展过程,两个时间点的前后契合,有“随着,一……就”的意思；（而本句中是突发事件,没有前后进展的过程,所以不能用）
所以用when 最合适
when,as,while这三个词都可以引出时间状语从句,它们的差别是：
when 的使用范围较广,可表示某时刻、某一时间点、或一段时间,有“当……时”的意思；
while 只表示一段持续的时间,不表示具体的时间点.（本句中显然是点时间,所以不能用）
as 从句表示进展过程,两个时间点的前后契合,有“随着,一……就”的意思；（而本句中是突发事件,没有前后进展的过程,所以不能用）
所以用when 最合适
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