a long time ago 、long long ago、once和once upon a time的区别

a long time ago 、long long ago、once和once upon a time的区别 long long ago 与 once upon a time 的用法区别 英语翻译The Dragon's Pearl Once upon a time,long ago,there lived A long time ago long long ago与long time ago的区别 As a long long time ago.. A long long time ago 歌词 A long time ago 与 Long time ago long long time ago long ago 和 a long time ago 有没有区别在语法上面? a long time ago 的同义词 a long time ago 的过去时