According to the air traffic rules, you ___ switch off your mobile phone before
题型：不详难度：来源：
According to the air traffic rules, you ___ switch off your mobile phone before boarding.| A．may | B．can | C．would | D．should |
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答案
| D |
解析
| should此处表示根据交通法规应尽的责任和义务。 |
举一反三
John promised his doctor he _____ not smoke and he has never smoked ever since.| A．might | B．should | C．could | D．would |
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_______ he had not hurt his leg, John would have won the race.| A．If | B．Since | C．Though | D．When |
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