单选题 Jenny didn't have time to go to concert last night because she was busy ______ for her examination.
A. preparing B. to be prepared C. to prepare D. being prepared

【正确答案】 A
【答案解析】本题考查固定结构。be busy doing sth．表示“忙于做某事”。主语she与动词preparle是主动关系。