问题
选择题
While you _________ your trip, I was busy ________ for my exams.
A. enjoyed, preparing B. were enjoying, preparing
C. were enjoying, to prepare
答案
答案：B
当你享受旅行时，我正忙于准备考试。While当。。。时，谓语通常用进行时态；而be busy doing sth忙于做某事。所以选B。
