在一密闭容器中进行如下反应：2SO2(气)+O2(气)
2SO3(气)，已知反应过程中某一时刻SO2、O2、SO3的浓度分别为0.2mol/L、0.1mol/L、0.2mol/L，当反应达平衡时，可能存在的数据是 （ ）
| A．SO2为0.4mol/L、O2为0.2mol/L | B．SO2、SO3均为0.15mol/L |
| C．SO2为0.25mol/L | D．SO3为0.4mol/L |
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