现有a=[1,2,3,4,5],执行
A.append([1,2,3])后,a列表的内容变成什么?
A.[1,2,3,4,5]
B.[1,2,3,4,5,1,2,3]
C.[1,2,3,4,5,"123"]
D.[1,2,3,4,5,[1,2,3]]
正确答案:D
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