________ as the “first lady of speech”，Dr, Lillian Glass is recognized as one of the world's leading experts on communication skills.
| A．Knowing | B．Having known |
| C．Known | D．To be known |
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________ as the “first lady of speech”，Dr, Lillian Glass is recognized as one of the world's leading experts on communication skills.
| A．Knowing | B．Having known |
| C．Known | D．To be known |
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