单选题 The governor had to ______ all his appointments for the day and rush to the train accident.
A. set off B. pay off C. see off D. call off

【正确答案】 D

【答案解析】call off意为“取消，停止”；set off意为“出发，动身，划分”；pay off意为“回报，使……有报偿”；see off意为“送行”。
译文：这位官员不得不取消当天的所有安排，奔赴火车事故现场。