加at, 因为noon是指中午十二点,在时刻前用at,在日前用on, 在年和月前用in,还有一些固定短语in the morning, in the afternoon, in the evening, at night, at noon当morning,afternoon, evening, night,noon前有修饰的成分时要用on如on a snowy morning
如果连在一起at noon,如果具体的某天如:on this Saturday noon