According to the air traffic rules,you should        your mobile phone before bo

According to the air traffic rules,you should        your mobile phone before bo

题型:不详难度:来源:
According to the air traffic rules,you should        your mobile phone before boarding.
A.switch overB.switch onC.switch offD.switch round

答案
C
解析
本题考查短语辨析。switch off关闭;switch over转变;switch on打开;switch round改变。句意:根据空中交通规则,你应当在降落之前把你的移动电话关闭。
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