—Is this your bag?—.A. Yes it isB. No it is.C. No this isn’tD. Yes. this is.

问题补充：

—Is this your bag?—.

A. Yes, it is

B. No, it is.

C. No, this isn’t

D. Yes. this is.

答案：

(答案→)A. Yes, it is

B. No, it is.

C. No, this isn’t

D. Yes. this is.

解析：is this your bag?意思是这是你的书包吗？询问的是your bag是单数故其答语常用it来替代。其肯定性回答常用yes，it is。否定性回答常用no，it isn’t。故选A。