At times I am ashamed, _________ there’s a difference between being ashamed and not doing _________ about it.

A．though; something                      B．but; anything

C．and; everything                           D．so; nothing

 At times I am ashamed，________ there's a difference between being ashamed and not doing ___________ about it.

A. though；something          B. but；anything

C. and；everything              D. so；nothing