19.
如图,A(0,-$\sqrt{2}$),点B为直线y=-x上一动点,当线段AB最短时,点B的坐标为( )
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| A. | (0,0) | B. | (1,-1) | C. | ($\frac{1}{2}$,-$\frac{1}{2}$) | D. | ($\frac{\sqrt{2}}{2}$,-$\frac{\sqrt{2}}{2}$) |