Question

【题目】---Has your friend completed his design?

---Not yet. He ________ on it last night.

A. worked B. has worked C. is working D. was working

Answer 1

【答案】D

【解析】试题分析：句意：——你的朋友完成他的设计了吗？——还没有。他昨天晚上正在从事这个设计。根据时间状语last night可知此处用的时间是过去的，根据语意，是他在过去的那个时间一直在做，故为was working。故选D。