已知椭圆与双曲线有公共的焦点,的一条渐近线与以的长轴为直径的

已知椭圆与双曲线有公共的焦点,的一条渐近线与以的长轴为直径的圆相交于两点,若恰好将线段三等分,则

       A.       B.       C.        D.

答案

C

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