– Does Mary have long hair? – Yes she does. But her sister long hair.A. doesn’t have B.

问题补充：

– Does Mary have long hair? – Yes, she does. But her sister long hair.

A. doesn’t have B. don’t haveC. don’t has

答案：

解析：句意：——玛丽留着长发吗？——是的，留着。但是她的姐姐没有留长发。连词But表示转折，前后的意思对立，前面是Yes, she does. “她留着长发”，所以后面的意思是没有留长发。因主语是her sister 第三人称单数，故其否定形式是 doesn’t have。故选A。