若f’（x）=g’（x），则下列等式（）成了。

A.f（x）=g（x）

B.f（x）>g（x）

C.f（x）D.f（x）=g（x）+c

-- Are you familiar       the music?

-- Yes. The music is very familiar       me, but I can’t remember when and where I heard it.

A．with; with

B．to; to

C．with; to

D．to; with