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题型:单选题 题类:常考题 难易度:普通

牛津版(深圳·广州)初中英语九年级下册Module 2 Environmental problems Unit 3 The environment 第4课时同步习题

According to the air traffic rules, you should __________your mobile phone before boarding (登机).
A、switch over B、switch on C、switch off D、switch round
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