题目内容
According to the air traffic rules, you ___ switch off your mobile phone before boarding.
A. may B. can C. would D. should
D
解析:
should此处表示根据交通法规应尽的责任和义务。
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题目内容
According to the air traffic rules, you ___ switch off your mobile phone before boarding.
A. may B. can C. would D. should
D
should此处表示根据交通法规应尽的责任和义务。