题目内容
19．Lessons can be learned to face the future，________ history cannot be changed．（ ）| A． | though | B． | as | C． | since | D． | unless |
分析 尽管历史无法改变，但是学习过去的经验可以（更好地）面对未来，．
解答 答案：A
though尽管；as因为；since因为；unless除非．题干表示的是转折的含义，意为"即使"，要用表示让步关系的连词though/although．故选A．
点评 连词是用来连接复合句的，类型较多，用法灵活．平时学习时，要注意区分和掌握．
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