Don’t use words, expressions, or phrases _______ only to people with specific knowledge．A.being knownB.having been knownC.to be knownD.known
网友回答
D解析本题考查非谓语动词作定语。being known表示正在进行；having been known一般作状语；to be known表示将来；words，expressions，or phrases和know之间是被动关系，且不强调动作发生的时间先后关系，所以用known作定语。