下列程序打印结果为()nl = [1,2,5,3,5]nl.append(4)nl.insert(0,7)nl.sort()print nl

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A、A. [1,2,3,4,5,5,7]
B、B. [0,1,2,3,4,5,5]
C、C. [1,2,3,4,5,7]
D、D. [7,5,4,3,2,1]
答案：A