选择合适的句子补全对话。
Simon:
Sam: Yes,it is.
Simon:
Sam: You're right.
Simon:
Sam: We always eat moon cakes and sing songs.
Simon:
Sam: OK. Let me tell you.
A. Can you tell me more about this festival?
B. Is it in autumn?
C. What do you do on that day?
D. Is it the Mid-Autumn Festival?