单项选择题

A.3-3-2/2-2-2-2/2-2-2-1-1
B.3-2-2-1/3-3-2/2-2-2-1-1
C.3-3-2/2-2-2-2/3-2-2-1
D.2-3-2-1/3-2-3/2-2-2-2