Now i am fine and busy---my lessons.A.at B .about C.and D.with说明原因

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Now i am fine and busy---my lessons.A.at B .about C.and D.with说明原因
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Now i am fine and busy---my lessons.A.at B .about C.and D.with说明原因
Now i am fine and busy---my lessons.A.at B .about C.and D.with说明原因

Now i am fine and busy---my lessons.A.at B .about C.and D.with说明原因
选D.be busy with sth./doing sth.忙于某事

根据《现代汉英词典》,忙于工作是 be busy with one's work.
所以选A (at) 或D都可以,但D(with)优先。