【題目】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：雖然歷史不可改變，但是吸取教訓來面向未來。A. though“雖然，盡管”；B. as“正如”；C.since“自從”；D. unless“除非” 。根據(jù)句意判斷可以知道前后句之間為轉(zhuǎn)折關(guān)系，故用連詞though連接。故A正確。

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