Barbara did not have time to go to the concert last night because she was busy ______ for her lecture.

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问题 Barbara did not have time to go to the concert last night because she was busy ______  for her lecture.

选项 A、to preparing
B、to be prepared
C、preparing
D、being prepared

答案C

解析 本题考查动词的搭配。句意:芭芭拉昨晚没有去看音乐会,因为她忙着为演讲做准备。be busy doing sth.为固定结构,表示“忙于做某事”。
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