You must turn off your cell phone when you take a plane.改为否定形式的同义句
You ....your cell phone when you take a plane.为什么
人气：421 ℃ 时间：2020-03-16 07:45:00
解答
保证答案准确率：= You (need not turn off) your cell phone when you take a plane.must解释为“必须”时,其否定形式一般为needn't,意思是“不必”.mustn't的意思是“禁止,不许”,不符合句意.如果对你有所帮助,请...
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