A: I've just heard that the tickets for Swan Lake have been sold out!

B: Oh, no! ___________

A. It doesn't matter.

B. It's not at all interesting.

C. I was looking forward to it.

D. I knew it already.

C 【解析】根据会话的语境：他们想要去看“天鹅湖”，结果票卖完了。另一人表示非常失望，说他渴望想看这部歌舞。前两项选择表示这部歌舞无聊，更后一个表示漠然的态度，都不符合当时的情景。