Question

【题目】 I was doing my homework yesterday evening, Mother was cooking dinner.

A. When B. While C. As D. Since

Answer 1

【答案】B

【解析】

试题分析：句意：昨天晚上当我在做作业的时候，妈妈在做晚饭。while连词，当…时候，引导时间状语从句，后跟进行时态。所以选B。