You must ______ at the airport an hour before your plane leaves.

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问题 You must ______ at the airport an hour before your plane leaves.

选项 A、check in
B、check out
C、check up
D、check on

答案A

解析飞机起飞前一小时你必须在机场登记。短语check in意为“(在旅馆、机场等)登记，检票进站”；check out“结账离去，办妥手续离去”；check up“核查，核实”；check on“核查，核实”。

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大学英语四级

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