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

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

admin2009-01-13  25
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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