go about (your) business
to do what you usually do.
How could she make such a big mistake and then go about her business as if it never happened?
Related vocabulary: go about something/doing something
英语词组固定搭配大全包含18674条英汉双解词组，基本涵盖了全部常用英文词组、短语的翻译及用法，是英语学习的有利工具。