--Hi,Grace,youlooktired. --I'mtired.I 国语站 题库 3.04W 大中小设置文字大小 问题详情: -- Hi, Grace, you look tired. -- I'm tired. I ____________________ on my homework all day. A. worked B. had worked C. have been working D. have worked【回答】C知识点:现在完成进行时及其被动式题型:选择题 TAG标签:ImtiredI HiGraceyoulooktired #