come back about noon (about seven o'clock) 这个短语在时间前面到底用不

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come back about noon (about seven o'clock) 这个短语在时间前面到底用不用at ,能说明理由吗?

一定要用at .
因为【at noon】在中午
【at seven o'clock】在七点钟
前都有at ,所以,【at about noon 】,【at about seven o'clock】
前也要用at,不能因为about 就省略at.
时间介词千万不能省.
所以
有不懂的继续问
再问：可是在全国外国语学校系列教材英语（综合教程）初一第二学期二单元的课文有下面这样一句话如何解释呢？The tour will take two hours so we'll be back about noon.
再答：这里的noon 作副词，所以前面没有at.
再问：那么放上at对不对呢？如果把这句话的时间改为about twelve o'clock是不是at 也可用可不用啊？为什么？这两种情况到底是用不用at都可以呢，还是那种情况必须用哪种情况坚决不能用呢？请原谅，我只是想把问题弄清楚，没别的意思啊。谢谢！
再答：在大部分情况下，时间介词（at,on,in) 必须加上, noon比较特殊，既可作adv.,又可作n. so,把它skip了。但我可负责地告诉你，【about twelve o'clock】前必须有at. 望采纳，O(∩_∩)O谢谢【永远的新概念】团队为您解答有不懂的继续问望采纳，O(∩_∩)O谢谢

rick has breakfast_____ about seven o'clock . -How about seven o'clock outside the park? about,is,thanks,I,seven,o'clock,it. At about seven'o clock 还是about at seven'o clock呢,什么修饰什么,副词和介 _____ about twelve o'clock It ( )light in the evening until about seven o'clock.then it It stays----in the evenings until about seven o'clock A.ligh It is about seven o’clock ( 1 ) a Morning, and it ( 2 ) rain she usually gets up at about seven o”clock on weekends At about ten o'clock,he came back from work.(同义句) My Monday 作文（用“现在进行时”,时间用例如"half past seven"、"seven o'clock" Come here before seven o'clock的同义句