答案：B

题目分析：句意：对不起，琳达，我迟到了。哦，凯瑞，你让我在这里等了你半个小时。keep sb doing sth使某人保持着一直做某事

点评：keep的用法尤以后面接双宾语的形式考查比较多，常见的短语有：keep doing sth.继续做某事keep on doing sth.持续做某事keep ... from doing sth.防止...做某事keep ... in mind牢记keep up with跟上keep away from...使离开等。