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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

A．being known    B．having been known C．to be known  D. known

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

A. being known　　　　　　　　　　　　　　　　  B. having been known

C. to be known　　　　　　　　　　　　　　　　  D. known