Lessons can be learned to face the futur...

Lessons can be learned to face the future, ________ history cannot be changed.

A.though B.as C.since D.unless

A 【解析】考查连词词义辨析及语境理解。句意：虽然历史不可改变，但是要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。故选A项。

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