【正确答案】 D

【答案解析】[解析] 画线词原形capability为名词，意为“能力；力量”。A项capacity意为“容量”；例：Each stadium had a seating capacity of about 50,000. 每个体育场均可容纳5万人左右。B项strength意为“力量”；例：He pushed against the rock with all his strength. 他用尽全力去推那块石头。C项possibility意为“可能性”；例：Is there any possibility that you'll be back by the weekend?周末之前你有可能回来吗?D项ability意为“能力”；例：They repeatedly questioned his leadership abilities. 他们一再质疑他的领导才能。故选D。