A：Are your books in the bookcase?B：. They’re on the desk.A. No it isn’tB. Yes it is C. Y

问题补充：

A：Are your books in the bookcase?

B：. They’re on the desk.

A. No, it isn’t

B. Yes, it is

C. Yes, they are

D. No, they aren’t

答案：

A. No, it isn’t

B. Yes, it is

C. Yes, they are

(答案→)D. No, they aren’t

解析：一般疑问句的简略回答。