单选题:若三阶方阵A的行列式等于零,则必有(  )

题目内容:
若三阶方阵A的行列式等于零,则必有(  ) A.A中至少有一个列向量是其余列向量的线性组合
B.A中每一个列向量均是其余列向量的线性组合
C.A中必有一列为零列
D.A的行向量组线性无关
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