在 ab 2 与 b 2 a,﹣2x 3 与﹣2y 3 ,4abc与cab,a 3 与4 3 , 与5,4a 2 b 3 c与4a 2 b 3 ,同类项的组数有 [ ]
A.
5组
B.
4组
C.
3组
D.
2组
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