以下程序输出的结果是（ ）。s = 'ABCDE'def fn(n): if len(n) == 1: return n else: return n[-1] + fn(n[:-1])print(fn(s))
A: BCDEA
B: ABCDE
C: EDCBA
D: CDEAB
A: BCDEA
B: ABCDE
C: EDCBA
D: CDEAB
举一反三
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