Job seekers are advised to avoid discussing confidential business knowledge acquired ( ) working for former employers.

A. even

B. beside

C. while

D. Throughout

【答案】C。定语从句结构分析和句意判断。“求职者们被建议避免谈论从上一份工作中获得的商业机密信息”，business knowledge后面的定语从句补充完整就是“which was acquired while working for former employers”，这里的while意思为“当……的时候”。