Don’t use words, expressions, or phrases_______ only to people with specific knowledge,
A．being knownB．having been known
C．to be knownD．known
D
考查非謂語動詞。不要使用那些只為那些具有專業(yè)知識的人知道的單詞、句式或短語。known to 作后置定語。單詞等是被知道的，故用過去分詞。
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