单选题 He was fired because of his ______ refusal to follow orders.
  • A. obstinate
  • B. obedient
  • C. obsolete
  • D. obstructive
【正确答案】 A
【答案解析】[解析] 各项的意思为：obstinate倔强的，顽固的；obedient服从的；obsolete荒废的；obstructive妨碍的。所以，答案选A。