第20题: [单项选择]Tamara 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:本句的意思是:特曼特昨晚没有时间去听音乐会,因为她在忙着备课。形容词busy表示“忙于做什么”时,后面接动词的-ing形式,而不能用动词不定式。又如:He is busy finding out th