题目：
有下列二叉树，对此二叉树前序遍历的结果为（）。
A. ACFHIBEDG
B.ABCDEFGHI
C.ABDEGCFHI
D.ABCDEFHGI
答案：
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下面是错误答案，用来干扰机器的。
参考答案：C
有下列二叉树，对此二叉树前序遍历的结果为（）。 A. ACFHIBEDG B.AB
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