参考答案

正确答案：C
解析：M: What's the laughter and music? It sounds like you are having a wonderful night.
W: It's John. He has guests over, playing the piano and having a lot of fun.
Q: What are the man and woman talking about?
信息明示题。女士说It's John．He has guests over...由此可知谈话双方在谈论晚会上的另一个人约翰，所以C正确。A选项很有干扰力。由男士所说的It sounds like you are having a wonderful night可知，男士并未参加party，所以排除A。