题干
We ______ such great success without your efforts. Thanks a lot.
A：shouldn’t have accomplished
B：couldn’t have accomplished
C：were unable to accomplished
D：mustn’t have accomplished
答案(点此获取答案解析）
B
3C(g)＋D(g)，达到平衡时C的浓度为W mol·L－1。若维持容器体积和温度不变，按下列四种方法改变起始物质及其量，达到平衡后C的浓度仍为W mol·L－1的是( )
