（）to have kept you waiting so long. Oh, never mind. After all, you are here.A、I am happy B、It's a pleasureC、I am sorryD、I am welcome
题目
（）to have kept you waiting so long. Oh, never mind. After all, you are here.
- A、I am happy
- B、It's a pleasure
- C、I am sorry
- D、I am welcome