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Python程序设计单选题中等

下面哪项是Python中条件判断的正确写法?

Aif x == 0 print('x是0')
Bif x == 0: print('x是0')
Cif x == 0: print('x是0') else: print('x不是0')
Dif x == 0: print('x是0') else print('x不是0')