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[单选题] 4.已知森林F及与之对应的二叉树T，若F的先根遍历序列是 a，b，c，d，e，f，中根遍历序列是 b，a，d，f，e，c，则T的后根遍历序列是
A.b, a, d, f, e,c
B.b,d, f, e, c, a
C.b, f, e, d, c,a
D.f, e,d, C, b, a

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