单选题
下列程序哪个是画一个三角形？（）
A.
turtle.forward(100)\nturtle.left(120)\nturtle.forward(100)\nturtle.right(60)\nturtle.backward(100)
B.
turtle.forward(100)\nturtle.left(60)\nturtle.forward(100)\nturtle.right(60)\nturtle.backward(100)
C.
turtle.forward(100)\nturtle.left(120)\nturtle.forward(100)\nturtle.right(60)\nturtle.forward(100)
D.
turtle.forward(100)\nturtle.left(120)\nturtle.forward(100)\nturtle.right(120)\nturtle.forward(100)
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