常用in、on、at作介词开头的词组答:on the New Year’s Eve, on the next morning, on the point of(正在…时候), on the spur of the moment(立刻) on this day, on this occasion, on time,at at a time(在某时), at a wedding(婚礼), at all times(一直), at any moment, at any time, at Christmas, at dark...