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【题目】Lessons can be learned to face the future, ________ history cannot be changed.
A.though
B.as
C.since
D.unless

【答案】A
【解析】句意:虽然历史不可改变,但是吸取教训来面向未来。A. though“虽然,尽管”;B. as“正如”;C.since“自从”;D. unless“除非” 。根据句意判断可以知道前后句之间为转折关系,故用连词though连接。故A正确。

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