【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】

試題分析：句意：根據(jù)空中交通規(guī)則的要求，你應(yīng)該在登機(jī)前關(guān)掉你的手機(jī)。ought to應(yīng)該，應(yīng)當(dāng)。故選A。

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