我在忙于为考试做准备(翻译) I'm busy ________ ________ _________the exam.

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我在忙于为考试做准备(翻译) I'm busy ________ ________ _________the exam.
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我在忙于为考试做准备(翻译) I'm busy ________ ________ _________the exam.
我在忙于为考试做准备(翻译) I'm busy ________ ________ _________the exam.

我在忙于为考试做准备(翻译) I'm busy ________ ________ _________the exam.
I'm busy (in) (preparing) (for) the exam.
be busy in doing sth. 忙于做某事,in可以省略