过去分词作定语
问题描述：
过去分词作定语
Don't use words ,experssions.or phrases( )only to people with specific knowledge.
A.being known
B.having been known
C.to ge known
D.known
答
D
就是过去分词作定语,不只lz是哪里不明白
A和B的being和having都是进行时概念,这句句子不强调进行时,不选