单选题 Prince Charles, the longest-waiting ______ to the throne in British history, has spoken of his "impatience" to get things done.
A. heir B. heirship C. heritage D. heiress

【正确答案】 A
【答案解析】[解析] 句意是：查尔斯王子是英国史上等待王位继承时间最久的人，他说自己已经“等不起了”。heir“继承人”；heirship“继承权，继承人的地位”；heritage“遗产，继承权”；heiress“女继承人”。因此本题选A。