-----Didyouhandinyourresearchpapertoourhistoryteachert... 国语站 题库 1.56W 大中小设置文字大小 问题详情: -----Did you hand in your research paper to our history teacher this morning? ---- Yes, I _____ on it for more than two months. A. have worked B. had worked C. was working D. had been working【回答】D知识点:过去完成时及其被动式题型:选择题 TAG标签:#