单项选择题
A.(3,3,3) B.9 C.[9] D.报错
A.[1,3,3] B.[1,3,2,3] C.[1,2,3,3] D.[1,3]
A.[1,2,3] B.[1,2] C.[2] D.[2,2,2]
A.[1,2,2] B.[1,2] C.[1,2,3] D.[2,2,2]
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