Tom was tired.He _______ all day.A was working B.has worked C worked ,Dhad been working

题目

Tom was tired.He _______ all day.A was working B.has worked C worked ,Dhad been working
分析一下原因

答案

选D
句意：Tom很疲劳,他持续工作了一整天.
have/has been doing sth.持续不间断的做某事