一句英语He graduated from the school,after which he went abroad

问题描述:

一句英语He graduated from the school,after which he went abroad
这个句子中after which是什么结构,

正确答案为:
after which 时间状语,which 指的是 he graduated from the scool 这件事.
他毕业了,之后他就出国了.
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