The thieves ran away as soon as the alarm . A. gave offB. put offC. showed off D. went off

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A. gave off
B. put off
C. showed off
(答案→)D. went off
解析：考查动词短语辨析。A发出（光，烟，气味）；B推测；C炫耀；D（警报）响；离开，消失，开火；句意：警铃一响，小偷们就跑走了。根据句意说明D正确。