【题目】According to the air traffic rules, you ______ switch off your mobile phone before boarding.
A . ought to B. may C. can D. would
在线课程【答案】A
【解析】
试题分析：句意：根据空中交通规则的要求，你应该在登机前关掉你的手机。ought to应该，应当。故选A。
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