头疼死了what are you doing for vacation为什么vacation前不加the

头疼死了what are you doing for vacation为什么vacation前不加the what are you doing for vacation?是什么时态 为什么 what are you doing for vacation What are you doing for vacation? what are you doing for vacation?doing为什么用ing形式啊 what did you do on vacation和what are you doing for vacation有 英语周报unit 3.what are you doing for vacation? What are you doing for vacation怎么缩写? What are you doing for vacation的作文 what are you doing for vacation各做什么成分? Peter:   What are you doing for vacation, Steven? What are you doing for vacation怎么翻译