when/while引导的时间状语从句 — 英语填空题
题目
用 when 或 while 填空。（1）I ___ was doing my homework, the lights went out suddenly. （2）The rain started ___ we were waiting for the bus. （3）___ the earthquake happened, we were having a class. （4）He hurt his leg ___ he was running away from the fire.