on seeing me,he walked up to me,smiling

问题描述:

on seeing me,he walked up to me,smiling
这句话中seeing前面为什么要加on?
1个回答 分类:英语 2014-09-27

问题解答:

我来补答
on/upon后面接doing或sth 构成一个状语,表示“一……就……”
On his arrival,he began to work
 
 
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