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 quite busy at I am busy working.同义句.I am busy ﹙ ﹚﹙﹚﹙﹚ i am very busy with the housework besides working是什么意思 be busy at do吗 为什么课本上是I am busy at work every day. I am busy at the moment.(改为同义句) are you at work now?i am also working是什么意思 I am working very hard at the office. am,hard,office,i,very,the,working,at 英语翻译i am working!very busy.这样翻译会不会太死板或者语法不对啊 I AM BUSY NOW? i am working I am working是什么意思 i am working on you look very busy.I ------you----hard for your examinationsa suppose,are working b am supposing,are working c am supposing,work d suppose,work NO I am not busy I am very busy at present.Can I call you back later? I am busy yesterday为什么加am