题目

(4分)在下表“类别”栏目内，选填合适的字母序号。 化学式HNO3NaHCO3Ca(OH)2S 类  别   A．非金属          B．酸式盐        C．酸          D．碱 答案： 25. ---You’ve missed such a good chance.  ---Yes, I        that job the boss offered me. A. must have taken    B. must take    C. should have taken    D. should take