I was doing my homework in my bedroom the light went out. I did it with a candle on.A. whi

问题补充：

I was doing my homework in my bedroom the light went out. I did it with a candle on.

A. which

B. while

C. when

D. where

答案：

A. which

B. while

(答案→)C. when

D. where

解析：句意：我正在我的卧室写作业，突然这时等灭了，我点了一支蜡烛做的作业。while “在......期间”，表示一段时间，引导的状语从句的谓语动词是持续性动词；when “在这时”，表示时间点，引导的状语从句的谓语动词是持续性动词或瞬间性动词。go out 是瞬间性动词，所以此处用when 来引导句子。故选C。