once upon a time，X months later, one day 后面是不是一定要加逗号

I.O.I组合Time Silp演唱会里的歌曲《Once Upon A Time》是谁唱的

周美欣唱的 百度可以下载 歌词： Once upon a time an angel in the sky made comfort every night once upon a time the angel loved me so it's a miracle in the snow my heart won't be cold my dear you are my angel tell me what you know something should be told my dear you are my angel tell me where you go I will breat...全部

  周美欣唱的 百度可以下载 歌词： Once upon a time an angel in the sky made comfort every night once upon a time the angel loved me so it's a miracle in the snow my heart won't be cold my dear you are my angel tell me what you know something should be told my dear you are my angel tell me where you go I will breathe behind your love Once upon a time my angle give me life 。
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