题目内容

_______ we cannot change yesterday, we can learn lessons to face tomorrow.

A. Though B. As C. Since D. Unless

A 【解析】句意:尽管我们无法改变昨天,但是我们可以吸取教训来面对明天。though尽管,引导了让步状语从句;as当……时候,引导时间状语从句;since因此,引导原因状语从句;unless除非,引导条件状语从句。结合句意,前半句表示我们无法改变昨天,后半句表示我们可以面对明天,前后是让步关系,故用连词though。故选A。
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