---Has Ingid handed in her paper yet?-I’m not sure. She on it last week.A. was working

问题补充：

---Has Ingid handed in her paper yet?

---I’m not sure. She on it last week.

A. was working

B. has worked

C. worked

D. had worked

答案：

A. was working

B. has worked

C. worked

D. had worked

解析：考查时态。根据句意可知上个星期她在写论文。指在过去的一段时间内正在做的事情，所以用过去进行时。句意：—Ingid的论文交了吗？—我不确定。上个星期她还在写。