23.【2020•湖北省黄石市】—I heard a young fireman lost his life in the big fire.
—What a pity! ________I don't know who he is, I know who he is for. He is our hero forever.
A．But B．So C．Although D．Because
【答案】C
【解析】句意：——我听说一位年轻的消防员在大火中牺牲了。——好遗憾！尽管我不知道是谁，但是我知道他为了谁。他永远是我们的英雄。考查连词。but但是；so因此；although尽管；because因为。“I don't know who he is”是让步状语，用连词although表示“虽然，尽管”，故选C。