on at 都可以啊 ..是初一的话建议用at .
work on:从事于,努力做 2.从事,不断工作 3.对…起作用；对…发生影响；向…做工作；使兴奋；左右 4.从事；对…有影响 5.继续工作,努力做
work at :1.从事于,致力于 2.从事；在…用功 3.对……下功夫,致力于
He worked ____ a book about animals.
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