在一个固定体积的密闭容器中，2molA和1molB发生反应2A(g)+ B(g)
3C(g)+D(g)，达到平衡时，C的浓度为W mol/L。维持容器体积和温度不变，按下列四种配比作为起始物质，达到平衡后，C的浓度仍为W mol/L，该配比是（ ）
| A．3molC+1molB | B．1molA+0.5molB+1.5molC+0.5molD |
| C．4molA+2molB | D．3molC+1molD+2molA+1molB |
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