I don't _____ the writer ,but i ____ him.

(A) know of ,know (B) know ,know of (C) know ,learn (D)learn ,know of

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a little difficult
I guess maybe A

i choose B

Actually B.
God bless

i thank the answer is b

I can only choose B as a try. I have never seen this kind of sentence.

i choose B

of course B

I choose b

i   choose  B!!