The old man came to our restaurant so ____ that all of us were familiar with him.

A. frequently
B. gradually
C. fluently
D. equally
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科目：高中英語 來源：山東省模擬題 題型：單選題

The old man came to our restaurant so ____ that all of us were familiar with him.
[     ]
A. frequently
B. gradually
C. fluently
D. equally

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