执行完下列代码后，坐标的位置是？（ ）import turtleturtle.penup()#抬起画笔turtle.goto(-50,0)turtle.pendown()turtle.forward(100)turtle.right(90)turtle.forward(100)turtle.done()
(0,0)
(-50,0)
(50,-50)
(50,-100)
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