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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如果你在機場安檢時，口袋有鑰匙、刀具、氣...
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