请问以下四种英文表达哪个选项不能用于机场出入境？
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请问以下四种英文表达哪个选项不能用于机场出入境？
A．How many luggages are you checking in？
B．How frequent is this subway service？
C．The passengers will start boarding 20 minutes before the departure time.
D．May I have your passport？
回答
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How frequent is this subway service?