busy to do sth 中式口语纠错:Bebusydoingsomething

中式口语纠错:Bebusydoingsomething  

【中文这样说】,我哥哥一直在忙着准备他的期末考试.,
【英文对比翻译】,Chinese Style My brother has been busy in preparing for his final examination.
American Style My brother has been busy preparing for his final examination.,Be busy doing sth为固定用法,中间不应加in,