单选题

下列哪一段代码是海龟走到指定坐标然后左转90度?(     )

A

turtle.goto(90,0) 

turtle.left(90)

B

turtle.left(90) 

turtle.goto(90,0)

C

turtle.goto(90,0) 

turtle.right(90)

D

turtle.right(90) 

turtle.goto(90,0)

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