如图,一直线与两坐标轴的正半轴分别交于,两点, 是线段上任意一点(

如图,一直线与两坐标轴的正半轴分别交于,两点, 是线段上任意一点(不包括端点),分别作两坐标轴的垂线与两坐标轴围成的矩形的周长为,则该直线的函数表达式是(    )
A.
B. C. D.

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