单选题

下列程序绘制的图形是?( )

import turtle
screen = turtle.Screen()
pen = turtle.Turtle()
pen.forward(100)
pen.right(90)
pen.forward(100)
pen.right(90)
pen.forward(100)
pen.right(90)
pen.forward(100)
turtle.done()


A

长方形

B

三角形

C

正方形

D

圆形

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