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【help】一道英语选择题!

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【help】一道英语选择题!
Good news!Police confirmed that the murder weapon ___________ in a nearby lake.
A、has since been discovered
B、had ever discovered
请问为什么选A而不选B?我觉得既然前面是 confirmed,是过去时,后面就要跟过去的某种时态啊,为什么是has?
【help】一道英语选择题!
被动语态 是被发现 最好是 had been discovered