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
网友回答
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。