第17485题 单选
给定Python列表操作代码的输出结果是什么?
ls = ["2021","123","Python"]
ls.append([2021,"2021"])
ls.append(2021)
print(ls)
A

['2021', '123', 'Python', 2021]

B

['2020', '123', 'Python', [2021, '2021']]

C

['2021', '123', 'Python', [2021, '2021'], 2021]

D

['2020', '123', 'Python', [2021], 2021]

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