His father was really a person. Once he made up his mind nothing could change it.A. clev

问题补充：

His father was really a person. Once he made up his mind, nothing could change it.

A. clever

B. stubborn

C. brave

D. familiar

答案：

A. clever

(答案→)B. stubborn

C. brave

D. familiar

解析：形容词辨析，A聪明的；B固执的；C勇敢的；D熟悉的。句意：他的父亲真是一个固执的人，一旦他下定了决心，没有什么可以改变它。根据后半句可知是很固执，不愿意改变自己的主意，故B正确。