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The book was written in 1964. Since when the education system has witnessed great changes这里为什么不能用since then
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~如果用since then，后半句就成了独立的一句话了。而英语中逗号是不能连接独立的两句话的。
所以要选择since when，这样后半句就成了一个定语从句。
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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