单选题:某二叉树共有7个结点,其中叶子结点只有l个,则该二叉树的深度为(假设根结点在第l层)(  )。

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题目内容:
某二叉树共有7个结点,其中叶子结点只有l个,则该二叉树的深度为(假设根结点在第l层)(  )。 A.3
B.4
C.6
D.7

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