suddenly,at once,once,just的用法及区别做题的时候应该注意什么?

immediately quickly at once suddenly suddenly,at once,once,just的用法及区别做题的时候应该注意什么? I recognized the man _ he came into the room.A.at once B.suddenly C.immediately D.quickly at once at once at once的同义词 用'at once造句, 英语翻译at once Everything At Once 歌词 at once啥意思 at once近义词各是什么意思 at once 的意思 at once意思? at once=什么? at once,immediately 区别 at once什么意思 Fold once at middle at once什么意思