--- ______the soldiers are very tried,______they keep on working.
---They are great. We must learn from them.A.Because; /B.Though; /C.Because; soD.Though; but
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B解析考查连词。Because因为；Though虽然，尽管； so因此；but但是；句意：虽然这些士兵很累，但是他们坚持工作。though引导的让步状语从句，不能与but同时出现在一个句子中。故选B。