—Are the keys yellow?—.A Yes it is B No they aren’t C Yes she is

问题补充：

—Are the keys yellow?

—.

A、Yes, it is B、No, they aren’t C、Yes, she is

答案：

解析：对于上文be动词为复数形式，肯定回答用Yes，they are。否定回答用No, they aren’t，故选答案为B