动词问题

Whatever he does, he works seriously with great care, do it well. 请问老师这句话是否有问题？第二部分，第三部分分别出现了works, do两个动词?

谢谢老师

Whatever he does, he works seriously with great care, do it well.

原句一定有误，去掉逗号，改为不定式作目的状语。应为：

Whatever he does, he works seriously with great care to do it well.

无论做什么，他都认真、细心地对待，把它做好。