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【单选题】
20150106字符串编辑有3种基本操作:在指定位置插入一个字符、在指定位置删除一个字符、在指定位置用另一个字符替换原来的字符。将字符串ABCDE编辑成ECDFE,至少需要执行(6) 次基本操作。
A.
2
B.
3
C.
4
D.
5
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