问题
选择题
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
答案：D
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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：D