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[2004.10]Jean didn't have time to go to the concert last night because she was busy ______ for the examination.
A.to prepare
B.to be prepared
C.preparing
D.being preparing
正确答案：C
答案解析：本题考查be busy doing为习惯用法，表示：忙于做什么。句中意思为Jean因忙于准备考试，故昨晚没时间去听音乐会。
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