单项选择题

What is required of all domestic and international passengers for check-in（）

A．An invitation letter.
B．A company’s job Offer.
C．An official photo identification.
D．An official immigration permit.

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单项选择题
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
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