中式口語糾錯:Bebusydoingsomething

【中文這樣說】

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我哥哥一直在忙着準備他的期末考試.

【英文對比翻譯】

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爲固定用法,中間不應加in