第4题: [单项选择]Jean did not have time to go to the concert last night because she was busy ______ for her examination. A. to prepare B. preparing C. to be prepared D. being prepared 参考答案:B 答案解析:be busy+动词+ing是习惯用法,故选项A和C可排除。在该习惯用法中,主语与动词+ing具有主谓关系,所以可以排除D项。全句的意思为:简昨晚没有时间去听音乐会,因为她正忙于复习迎考。