题目内容：
---It is not a secret that CEOs of major companies earn a large amount each year.
--- I agree. ____ the hard economic times, it seems that their salaries have remained the same.
A．Apart from
B．Thanks to
C．Regardless of
D．In regard to
正确答案：
C
答案解析：
句意：—大公司的总裁薪水很高，这不是秘密。—我也这么认为，不管是不是经济困难时期，他们的薪水似乎保持不变。
考点核心：
序数词的概念：
表示顺序的数称为序数词。如：first, second, third, fourth。
