◎ 题干
Don't use words, expressions, or phrases         only to people with specific knowledge.     
[     ]
A. being known              
B. having been known      
C. to be known                
D. known
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Don't use words, expressions, or phrases only to people with specific knowledge.[ ]A. being known B. having been knownC. to be knownD. known…”主要考查了你对  【过去分词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。