According to the air traffic rules, you ______ switch off your mobile phone before boarding.

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问题 According to the air traffic rules, you ______ switch off your mobile phone before boarding.

选项 A、may
B、can
C、would
D、should

答案D

解析 may：可能；can：可以；would：将要；should：应该。此处表示根据交通规则应尽的责任和义务，应用should。

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英语

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