语法与词汇 15.He displayed a complete lack of courtesy and tact in dealing with his employer.

【正确答案】 C

【答案解析】句意：他在处理与老板的关系时缺乏礼貌，举止不够得体。courtesy谦恭有礼，礼貌。civility礼貌；客气；礼仪。tenacity韧度；固执，坚持。curiosity好奇心。hostility敌意，敌对状态。