语法与词汇 That he was able to ______ his responsibilities with such competence and apparent ease was partly due to his experience in the Royal Navy.

【正确答案】 A

【答案解析】句意：他能够以这样的能力履行自己的职责，而且明显很轻松，部分原因是他在皇家海军的经验。 discharge responsibility履行责任。