在密闭容器中一定量混合气体发生反应:2A (g) + B (g)) xC(g),达到平衡时测得 A的浓度为 0.5 mol/L,在温度不变的条件下,将容器的容积扩大到原来的2倍, 再达平衡时测得A的浓度为 0.3 mol/L ,下列有关判断正确 ( ) A. x = 3 B. 平衡向正反应方向移动 C. B的转化率降低 D. C的体积分数增大 — He ought to have been warned of the danger. — ______, but he just wouldn’t listen to me. A. So ought he B. So he was C. So was he D. So he had