While you _________ your trip, I was busy ________ for my exams.
A. enjoyed, preparing       B. were enjoying, preparing   
C. were enjoying, to prepare
B
當你享受旅行時，我正忙于準備考試。While當。。。時，謂語通常用進行時態(tài)；而be busy doing sth忙于做某事。所以選B。
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