若由AB=AC必能推出B=C（A，B，C均为n阶矩阵）则A必须满足（ ）。\n \n \n \n \n \n \n

\n \n \n \n A.\n A≠O\n

\n \n

\n \n \n \n B.\n A=O\n

\n \n

\n \n \n \n C.\n

\n \n \n

\n \n \n \n D.\n