单选题 She felt that she was the most solitary person on earth.

【正确答案】 B
【答案解析】[解析] solitary：孤独的，和isolated(孤立的、与世隔绝的)词义相近；gloomy：郁闷的、忧郁的；feeble：虚弱的、无力的；frugal：节约的。