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According to the air traffic rules, you ...

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

A . ought to      B. may       C. can       D. would

 

A 【解析】 试题分析:句意:根据空中交通规则的要求,你应该在登机前关掉你的手机。ought to应该,应当。故选A。 考点:考查情态动词。  
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