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【单选题】
实践作为检验真理的标准，既是确定的又是不确定的，其不确定性是因为：A.
任何实践检验都需要一定的逻辑证明作为其补充手段
B.
作为检验真理标准的社会实践总要受到历史条件的限制
C.
不同的阶级、不同的人的实践标准是不同的
D.
有些真理是无法通过实践加以检验的
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