题目内容：
An international flight passenger should check in at least__________．
A)20 minutes before departure
B)30 minutes before departure
C)45 minutes before departure
D)60 minutes before departure
参考答案：
答案解析：
单选题：An international flight passenger should check in at least__
- 题目分类：英语三级A级
- 题目类型：单选题
- 查看权限：VIP
An international flight passenger should check in at least__________．
A)20 minutes before departure
B)30 minutes before departure
C)45 minutes before departure
D)60 minutes before departure