Question

【题目】—What was Tom doing _______ it was raining?

—He was doing his homework in the bedroom.

A. since B. while C. when D. if

Answer 1

【答案】B

【解析】

试题分析：句意：-下雨时汤姆在做什么？-他在卧室里做作业。Since自从； while 当……的时候，常表示主句动作和从句动作同时发生；when当……的时候，if如果。所以选B。