Passengers should send their application to Air France____. A、upon receiving the application form B、within 3 weeks of their first flight C、before their first flight with Air France D、within 6 months of joining the program

Passengers should send their application to Air France____.
A、upon receiving the application form

B、within 3 weeks of their first flight

C、before their first flight with Air France

D、within 6 months of joining the program

出自：四川民族学院大学英语 B卷

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