参考答案：A

解析：[听力原文]
M: Here are coming seven guests in the evening. Have you prepared enough food, dear
W: I forget to tell you that the couple Smith won’t come.
Q: How many guests will be at the dinner

M：今晚有七位客人来：亲爱的，我们准备足够的食物了吗
W: 我忘记告诉你史密斯夫妇不来了。
问：多少客人会来吃晚餐