According to the air traffic rules, you ___ switch off your mobile phone before boarding.
A．mayB．canC．wouldD．shall
D

試題分析：考查情態(tài)動(dòng)詞shall的用法：shall用于第二人稱第三人稱，可以表示警告，命令，允諾，規(guī)定，此處表示根據(jù)交通法規(guī)應(yīng)盡的責(zé)任和義務(wù)。句意：根據(jù)交通法規(guī)，在登機(jī)前應(yīng)該關(guān)掉手機(jī)。選D。
點(diǎn)評(píng)：情態(tài)動(dòng)詞shall的用法是近幾年的高考常考點(diǎn)，用于第一人稱，表示提出建議，用第二人稱表示警告，命令，允諾，用第三人稱表示征求意見。做題時(shí)具體的結(jié)合句意做題。
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