Question

【题目】I ______ my homework on the computer when the power went out.

A. was doing B. will do C. do D. did

Answer 1

【答案】A

【解析】句意：停电时我正在电脑上做家庭作业。考查句子时态辨析。A. was doing过去进行时；B. will do一般将来时； C. do一般现在时；D. did一般过去式。When当…时候，它引导的时间状语从句，从句用一般过去式，主句一般用过去进行时；结合句意、语境和选项可知选A。