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【单选题】
如果单项式﹣3x a y 2 与x 3 y b 是同类项，则这两个单项式的和是 [     ]
A.
2x 2 y 2
B.
﹣2x 3 y 2
C.
﹣2x 6 y 4
D.
﹣3x 3 y 2
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