—_________. She is my sister.

A.Yes, she isB.No, she isn'tC.No, she is

【答案】B

【解析】

句意：—她是你的朋友吗？—______。她是我的姐姐。这是is引导的一般疑问句，肯定回答Yes, she is.否定回答B. No, she isn't.根据语境，应是否定回答，故选B。