英语 九年级 选择题 简单 时间状语从句 when/while — 英语选择题 外研社版(主编:孙有中)·英语 Unit 3 Past passing by AI 三重审校通过 题目 — I was doing my homework ______ my brother was playing chess with his friend. — No wonder you didn't hear the phone ring. A. while B. when C. before D. until 登录后查看答案与解析 用此考点生成试卷 本单元全部练习题 更多英语选择题