i was walking along the street▁i met a friend of mine .划横线的填什么?

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iwaswalkingalongthestreet▁imetafriendofmine.划横线的填什么?iwaswalkingalongthestreet▁imetafriendofmine.划横线的

i was walking along the street▁i met a friend of mine .划横线的填什么?
i was walking along the street▁i met a friend of mine .划横线的填什么?

i was walking along the street▁i met a friend of mine .划横线的填什么?
when(突然)