第23题: [单项选择]Barbara did not have time to go to the concert last night because she was busy ______ for her lecture. A. to preparing B. to be prepared C. preparing D. being prepared 参考答案:C 答案解析:[考点] 动名词
[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。
[解析] be busy doing sth.为固定结构,表示忙于做某事。