语料出自The Atlantic一篇题目为The Swiss Secret to Jump-Starting Your Career的文章

http://yingyushijie.com/business/detail/id/3653/category/46.html

作者：Dwyer Gunn，a journalist and contributing writer @PacificStand

  但这句话，在文中是直接引语，如下：

“In a world where the sectors are dynamic, and a sector that’s in high demand today might not even be around tomorrow, there’s a danger in specializing,” Holzer, the Georgetown professor, said. “What you really hope for is that whatever sub-B.A. credentials people get, that they are portable... at a minimum across firms, and ideally even across sectors and industries.”

口语是不规范的，如果把一个人的日常话语录制下来，即便他文化素养多高，也难免都符合书面语的要求。

所以呢，这个Georgetown professor也确实多用一个that。

葛传槼老先生在《英语惯用法词典》that词条也说过这个问题：

12．在较长的名词从句里往往有多余的连接词 that，如下面各句里斜体的 that 是多余的，该删去： 
It should be borne in mind that while different persons have different opinions, and that therefore they may not be able to agree upon a definite course of action, the problem is so important that it should not remain unsolved for any length of time. 

It is quite doubtful whether if he had arrived at the station five minutes earlier, or if the train had started five minutes later, that he would have caught the train. 

I suggest that while these questions are being discussed and the conditions are being investigated, that the work should be carried on as usual. 

You may rest assured that if you read any book carefully through, looking up all the difficult words and phrases and allusions in dictionaries and other reference books, dwelling upon passages of particular interest to you, and jotting down everything that you think you may have use for some day, that you will soon acquire an ability to write expressive English. 

这几个句子，我估计是外国人写的。哈哈，人非圣贤孰能无过。