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

来源:学生作业帮助网 编辑:作业帮 时间:2024/07/14 22:34:21
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