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【单选题】
已知抛物线y 2 =2px(p>0)的焦点F与双曲线 - =1的右焦点重合,抛物线的准线与x轴的交点为K,点A在抛物线上且|AK|= |AF|,则A点的横坐标为(　　)
A.
2
B.
3
C.
2
D.
4
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