take that next step中的that是什么句子成分

问题描述

A positive response to a new idea from an engineer, a venture capitalist, or just anyone listening, is often enough to motivate someone to take that next step.

上文中的 that 是什么词，什么句子成分，去掉可以吗？谢谢回答。 

老师答疑

曹老师：

that为指示限定词，表示特指意义。that指代的是前一句提到的内容。that next step一定在前面有交代的。