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    精英家教网 > 高中英语 > 题目详情
    According to the air traffic rules, you______switch off your mobile phone before bearding.
    A．may B．canC．would D．should
    D
    此题考查情态动词的用法。根据句意“按照空中交通规则，你应当在登机前关掉你的手机”，所以只有should(应该，应当)符合题意。
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