设串 S1 = '1234567' S2 = 'abab' S3 = 'AAA' S4 = '+-*/@#' 则执行replace(S1 substr(S1 4
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设串 S1 = "1234567" ,S2 = "abab" ,S3 = "AAA" ,S4 = "+-*/@#" ,则执行replace(S1,substr(S1,4,length(S3)),concat(S3,substr(S4,length(S2),index(S2, "a")))) 的结果串是()。
A."1234AAA@"
B."123AAA/7"
C."123AAA7"
D."123AAA/@#7"

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'123AAA/7'
