—Is there a ball under the desk? —.A. Yes it is B. Yes there’s C. No there isn’t

问题补充：

—Is there a ball under the desk?

—.

A. Yes, it is B. Yes, there’s C. No, there isn’t

答案：

解析：句意：在桌子底下有一个球吗？肯定回答，Yes, there is, there is 不可以缩写。否定回答，No,there isn’t. 故选C。