Knowing office rules—whether or not—is critical, 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:考查非谓语动词。此处written作office rules的定语,表示已经写出来的。Rules跟write之间是被动关系,排除B,C项表示正在写。D作状语,不作定语