They have been waiting for many hours to see the singer, but the airplane must have been ____. ( 章节：2 难度：2)
- A、off time
- B、on time
- C、ahead of schedule
- D、behind schedule
正确答案:D
答案解析:有
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They have been waiting for many hours to see the singer, but the airplane must have been ____. ( 章节：2 难度：2)
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