While I was at the booking office buying a ticket, father saw to my luggage.
请问各位老师,I was的表语是at the booking office还是buying a ticket呢?
《高考英语备考1号·速效编》
《高考英语备考1号·写作编》
《高中英语晨读晚记》
《高中英语错题笔记》
《零起点考大学英语》