Question

While you _________ your trip, I was busy ________ for my exams.
A. enjoyed, preparing       B. were enjoying, preparing   
C. were enjoying, to prepare

Answer 1

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。