学员疑问：老师，麻烦帮我看一下这道题。我觉得应该是C啊，to pay attention和to track是并列成分，两个都是能力。省略了to
 
老师解答：答案选D没有问题
点评分析：

按你的理解是the ability to track and to pay , 也就是other skills  , such as A  ， A = the ability to track and to pay