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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notonlytombutalsobobhasbeentothatislandbefore这句话是对的,可是before为啥这里用在完成时态呢notonlytombutalsobobwastothat

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
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

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
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