What were you doing when the UFO arrived?是个什么时态的什么句子?

What were you doing when the UFO arrived?是个什么时态的什么句子? What were you doing when the UFO arrived?是个什么从句? what were you doing when the UFO arrived? what were you doing when the ufo arrived 作文 unit 3 what were you doing when the ufo arrived? 用括号里的时间状语改写下列句子 what were you doing when the UFO arrived?(at 初二英语Unlt3 What were you doing when the UFO arrived 1b的翻译 2 Unit3 What were you doing when the UFO arrived? 的答案 人教八下Unit 3 What were you doing when the UFO arrived?原文 What were you doing when the UFO arrived?和I was walking down what were you doing when he arrived what were you doing yesterday什么时态