not only tom but also bob has been to that island before这句话是对的,可是before为啥这里用在完成时态呢not only tom but also bob was to that island before 实际上题目是这样的not only tom but also bob___(be) to that island bef

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not only tom but also bob has been to that island before
这句话是对的,可是before为啥这里用在完成时态呢not only tom but also bob was to that island before 实际上题目是这样的not only tom but also bob___(be) to that island before

ago 通常与一般过去时连用,不能与完成时连用;before通常与过去完成时连用.
很显然 这里填现在完成时 就近原则,bob单三 填 has been to(去过某地)
你这句就不对了,原因你懂得.
祝你学习进步