单选题：Given a tree of degree 3. Suppose that there are 8 leaf nodes an

Given a tree of degree 3. Suppose that there are 8 leaf nodes and 2 nodes of degree 3. Then the number of degree 2 nodes must be \_\_\_\_.

@[D](3)

A. 0
B. 1
C. 2
D. 3



A.0
B.1
C.2
D.3


答案：D