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as soon as possible,upon,at that moment.这几个词组之间有什么区别

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as soon as possible,upon,at that moment.这几个词组之间有什么区别
as soon as possible,upon,at that moment.这几个词组之间有什么区别
这三个短语主要是从意思方面去区别
as soon as possible=as soon as sb.can do 尽快做某事,如:
Please write to me as soon as possible.
upon(=on) 表示"一……就" 后面接名词或动词的ING形式.如:
On arrival/ arriving at the village,he began to work.他一到那个村庄就开始工作.
at that moment =at that time 就在那时
At that moment,the train began to move suddenly.