单选题
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
【正确答案】
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。
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