题目内容：
If a flight is oversold, passengers without seat assignments are usually at the risk of（）boarding.
A.denied
B.being denying
C.being denied
D.denying
参考答案：【答案仅供学习，请勿对照自行用药等】
选择题：If a flight is oversold, passengers without seat assignments
- 题目分类：中国大学MOOC慕课
- 题目类型：选择题
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