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30.If you carry keys, knives, aerosol cans, etc., in your pocket when you pass through the security at the airport, you may __________ the alarm, and then the airport personnel will come to search you.
(A) let on
(B) let off
(C) set on
(D) set off


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難度: 困難
1F
柯文容 國三下 (2016/10/24)

aerosol 噴霧器

set off  v.出發,動身,使爆炸,引起,使爆發,抵銷,分開,襯托

30.If you carry keys, knives, aerosol ca..-阿摩線上測驗