According to the air traffic rules, you______switch off your mobile phone before bearding.
A．may B．canC．would D．should
D
此題考查情態(tài)動(dòng)詞的用法。根據(jù)句意“按照空中交通規(guī)則，你應(yīng)當(dāng)在登機(jī)前關(guān)掉你的手機(jī)”，所以只有should(應(yīng)該，應(yīng)當(dāng))符合題意。
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