We were swimming in the river ____ suddenly the rain started.为什么这里填when不可以while?

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Wewereswimmingintheriver____suddenlytherainstarted.为什么这里填when不可以while?Wewereswimmingintheriver____su

We were swimming in the river ____ suddenly the rain started.为什么这里填when不可以while?
We were swimming in the river ____ suddenly the rain started.
为什么这里填when不可以while?

We were swimming in the river ____ suddenly the rain started.为什么这里填when不可以while?
while只能接延续性动词.
when既可接短暂性动词;也可接延续性动词,表示动作正在进行.
We were swimming in the river when suddenly the rain started
就在我们游泳的时候突然下起雨来了.
started 是短暂性动词.
另外,一楼说得也很在理,when suddenly 这两个词连在一起表示突然的意思.

while一般引导一段时间
when引导一个时间点,短暂的动作。
We were swimming in the river when suddenly the rain started
句子中的when具体表示就在这个时候,就在我们游泳的时候突然下起雨来了。
表示一个时间点,而不是一段时间

when suddenly 这两个词连在一起表示突然的意思。这个是固定的搭配撒。。