I happened_(meet)one of my old friends while I was walking in the street

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I happened_(meet)one of my old friends while I was walking in the street
I happened_(meet)one of my old friends while I was walking in the street

I happened_(meet)one of my old friends while I was walking in the street
to meet,happen to do表示碰巧做什么事

to meet

I happened to meet one of my old friends while I was walking in the street ..

to meet