单选题 The flight scheduled ______ at 9 a. m. was delayed four hours due to the bad weather.
【正确答案】 A
【答案解析】[考点] 固定搭配 [解析] schedule to do sth.为固定搭配,意为“计划做某事,安排做某事”。故选A。take off意为“起飞”,用于主动语态,不需要被动语态,故排除D项。