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根据短文内容，选择最佳答案，并将选定答案的字母标号填在题前括号内。
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