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单选题 函数f打印出1,2,3的6个排列,空缺语句是def f(n): for a in range(1,n): for b in range(1,n): for c in range(1,n): if ______________: print(a,b,c)_________
A. a!=b and b!=c and c!=af(4)
B. a!=b and b!=c and c!=af(3)
C. a!=b and b!=cf(4)
D. a!=b and b!=cf(3)

学科:默认课程
时间:2025-09-20 03:25:06
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