设有下列二叉树：


对此二叉树中序遍历的结果为______。

A) Private Sub Form_DragDrop(Source As Control,X As Single,Y As Single)
banana.Move Picture1.Left+X,Picture1.Top+Y
End Sub
B) Ptivate Sub banana_DragDrop(Source As Control,X As Single,Y As Single)
Source.Move Picture1.Left+X, Picture 1.Top+Y
End Sub
C) Private Sub Picture1_DragDrop(Source As Contro1,X As Single,Y As Single)
Source.Move Picture1.Left+X, Picture1.Top+Y
End Sub
D) Private Sub Picturel_DragDrop(Source As Contro1,X As Single,Y As Single)
banana.Move banana.Left+X, banana.Top+Y
End Sub

A) 在List2中插入了"外语"、"物理"两项
B) 在List1中删除了"外语"、"物理"两项
C) 同时产生A) 和B) 的结果
D) 把List1中最后一个列表项删除并插入List2中