Knowing office rules, whether or not, is always of great importance, especially for young job seekers.
A. written
B. writing
C. being written
D. having been written
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(答案→)A. written
B. writing
C. being written
D. having been written
解析：考查分词用法。Office rules与write构成被动关系，使用过去分词。句意：对于年轻的寻找工作的人来说，了解办公室规则无论有没有被写下来是非常重要的。