PHRASAL VERB 对…纠缠不休；对…说个没完 If you keep on at someone, you repeatedly ask or tell them something in a way that annoys them. 对…纠缠不休；对…说个没完 [British, informal]
You've constantly got to keep on at people about that. [VERBPREP.PREP. noun]
你总是得没完没了地和别人说那件事。
She kept on at him to get some qualifications. [VPP n to-inf]