单选题 He was fired because of his ______ refusal to follow orders.
【正确答案】 A
【答案解析】(obstinate固执的,顽固的)。句意为:他因固执地拒绝遵守命令而被解雇。B.obedient服从的;C.obsolete已废弃的;D.obstructive妨碍的。