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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本试题收录于: 英语题库普高专升本分类
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