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

admin2012-03-02  39

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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