be on (someone's) back
informal
to keep asking someone to do something, or to keep criticizing someone in a way that annoys them.
He's still on my back about those end of term reports.
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。