They have been waiting for many hours. The airplane must have been ______.

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问题 They have been waiting for many hours. The airplane must have been ______.

选项 A、of schedule
B、on schedule
C、ahead of schedule
D、behind schedule

答案D

解析 本题测试介词短语的用法。根据题意,是指航班晚点,故应选behind schedule“落后于预定计划”。of schedule搭配不存在;on schedule“按时”;ahead of schedule“提前”。
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