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Python程序设计单选题中等

以下代码中,哪个循环结构是非嵌套的?

Afor i in range(3): for j in range(2): print(i, j)
Bfor i in range(3): print(i); for j in range(2): print(j)
Cwhile True: for i in range(3): print(i)
Dif 1 == 1: for i in range(3): for j in range(2): print(i, j)