下列图形可能是哪段代码执行后的结果？（ ）
importturtle
turtle.shape("turtle")
turtle.forward(120)
turtle.right(90)
import turtle
turtle.shape("turtle")
turtle.forward(120)
turtle.right(-90)
import turtle
turtle.shape("turtle")
turtle.forward(120)
turtle.right(180)
import turtle
turtle.shape("turtle")
turtle.forward(120)
turtle.right(-180)
