Question

Don’t use words ,expressions or phrases __________ only to people with
specific knowledge.

A．being known

B．to be known

C．known

D．having been known

Answer 1

C

这题考查过去分词做定语的用法：words ,expressions or phrases是被大家知道，所以用过去分词，句意是：不要用些只是有专业知识的人才知道的单词短语和表达法。选C。