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

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 根据空中交通规则，你应该在上飞机前关上手机。本题考查的是情态动词。只有D项表示“应该”，故选D项。
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