【題目】According to the air traffic rules, you ______ switch off your mobile phone before boarding.
A.ought to
B.may
C.can
D.would

【答案】A
【解析】句意：根據(jù)空中交通規(guī)則的要求,你應該在登機前關(guān)掉你的手機。ought to應該,應當。故選A。

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