--- I’m sorry I broke your coffee cup.

　     --- Oh, really? ______________.

　   A. It doesn’t matter                   B. I don’t know  

C. it’s OK with me                    D. You’re welcome

--I'm sorry，I broke your cup．

--Oh，really? ________．

A．Not at all                                          B．Don't be sorry

C．It doesn't matter                                 D．It's OK with me