John is a(n) _____ caller of my blog and always leaves a few words to me.

A. official
B. frequent
C. fluent
D. upset
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科目：高中英語 來源：同步題 題型：單選題

John is a(n) _____ caller of my blog and always leaves a few words to me.
[     ]
A. official
B. frequent
C. fluent
D. upset

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