I am busy working at my lessons.这里的at是不是用错了啊?为什么?

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• I am busy working at my lessons.这里的at是不是用错了啊?为什么?
• I am busy working at my lessons.这里的at是不是用错了啊?为什么?
• I am too busy to do the huosework同义句I am too busy to do the huoseworkI have _____ _____ to do the housework
• I am feeling ____ (bad) today than yesterday.