Question

9. —Are they going to play table tennis?

   —  . But they are going to play football.

   A. Yes,they are    B. No,they aren’t

   C. No,they don't   D. Yes,they do

Answer 1

9. B

9. B 从回答可以看出他们不打算打乒乓球，因此为否定回答，直接用be动词的否定形式aren’t,不用don't。