单选题 By now Dad was sixty-five, and what little lenience he may once have possessed had long since hardened into______inflexibility.
A. compassionate B. friendly C. remorseful D. steely

【正确答案】 D

【答案解析】[解析] compassionate“富于同情心的”；friendly“友好的”；remorseful“懊悔的，悔恨的”；steely“似钢的，冷酷的；无情的”。