I was about to go for a walk ___ it began to rain .when whil

I was about to go for a walk ___ it began to rain .when while as which 为什么A不是B
A when B while C as D which
be about to do 后不是不能加时间状语吗

WHILE后面通常加一段时间 例如I CAN TAKE CARE OF MYSELF WHILE YOU ARE ON HOLIDAY 而WHEN更接近于那一时间点WHEN HE CAME BACK,I WAS DOING HOMEWORK.根据题意 我刚要去散步就下起了雨 说的更偏向于时间点 所以相比之下 应选WHEN更合适
2可以加时间状语啊 将来时一共有三种表达方法,1 WILL SHALL+DO表示主观意愿 2 BE+ DOING表示计划,3 BE ABOUT TO DO有刚要 即将要..的意思 可以加时间状语