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He fought the wolves off for three hours before help arrived. 这个前半句应该是过去完成时才对
网校学员ur4**在学习新概念英语2、3、4册连读【双11专享班】时提出了此问题，已有1人帮助了TA。
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同学你好，该知识点来自沪江网校《新概念英语2、3、4册连读【双11专享班】》的课程，想要更系统的学习，欢迎进入课程学习。不仅可以和更多的同学一起学习，而且还有老师、助教随时的学习指导和知识点解答哦。
同学你好~用过去完成时也可以。
但是before已经表示了明确的先后顺序了，所以有before的句子里不用过去完成时也是对的，因为可以很明确地知道哪个动作在前。
祝同学学习进步~
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新概念英语2、3、4册连读【双11专享班】
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