Question

【题目】（题文）（2017江苏南京）—When did the classroom have a power cut?

—This morning, while we ________ a physics lesson.

A. have had B. were having C. are having D. will have

Answer 1

【答案】B

【解析】本题考查时态。句意“-教室什么时候停电的？-今天早晨，当我们在上物理课时”。根据句意，指的是当我们正在上物理课时停电了，且第一句用的是did，故用过去进行时，故选B。