单选题
绘制图形时，程序中应补充什么？
import turtle n = 10 for i in range(1, 10, 1): for j in [90, 180, -90，0]: [ ] n += 5
A.
turtle.seth ([j])
turtle.fd (n)
B.
turtle.seth ([i])
turtle.fd (n)
C.
turtle.seth (i)
turtle.fd (j)
D.
turtle.seth (i)
turtle.fd (n)
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