With a preposition:He got out of bed to see what had happened __

With a preposition:
He got out of bed to see what had happened ______the night.
【正确答案】：in
【题目解析】：表示时间时，in用于表示比一天或长或短的一段时间；on 用于指一天或具体某一天时间段；at可能是唯一用于表达非持续性含义的介词，说明时间点；at也可以表示日子，这种情况下，时间段仍被视为时间点。