By the time the police arrived ,they (kidnap)the poor boy successfully yet.

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By the time the police arrived ,they (kidnap)the poor boy successfully yet.

hadn't kidnapped
由arrived知是过去完成时,又由yet知道要用否定.
整句话意思是,直到警察赶来时,他们还尚未成功劫持那可怜的男孩.

had not kidnapped
过去完成时 (指过去的过去)
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