Knowing office rules whether or not -- is important, especially for young job seekers.

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(答案→)A. written
B. writing
C. being written
D. having been written
解析：考查状语从句的省略：句意：了解办公室规则——不管写出与否 ，是很重要的,特别是年轻的求职者。Whether引导是让步状语从句，完整的从句应该是Whether office rules are written or not，从句的主语和主语的主语是一致的，可以省略从句的主语和be动词，所以选A。