Tom in the library every night over the last three months. A. hworks B. worked C. have been working

题目

Tom in the library every night over the last three months. A. hworks B. worked C. have been working
D,Had been working,答案应该选什么

答案

选C.OVER+表示一段时间的词,通常表示的是从现在算起的过去几年/几月/几日等,因此通常与现在完成时连用.