问题描述：
Don't use words,expression or phrases _____only to people with specific knowledge.
A being known B having being known
C to be known D known
一点也不懂 并且把句子翻译
A being known B having being known
C to be known D known
一点也不懂 并且把句子翻译
问题解答：
我来补答展开全文阅读