【正确答案】 A

【答案解析】single-handed：adv. 独立地；如：He finished the job single-handed. in person：亲自；直接地，如：The President heard their stories in person. 总统亲自听他们的故事。英语中没有all his own, 只有on one's own: 独自，靠自己，如：He runs a factory on his own. 他独立经营工厂。