in与on的区别和用法时间

　　They will see you in a week．

　　他们将在一周后去看你。

　　He got up late in the morning and had a meal at noon．

　　他早上起得晚,所以只吃午餐。

　　It startled me to find her sitting in my office.

　　我一进办公室，发现她坐在里面，把我吓了一跳。