题目内容

执行以下程序段a$="abbacddcba"For i=6 To 2 Step -2X=Mid(a,i,i)Y=Left(a,i)z=Right(a,i)z=UCase(X & Y & z)Next IPrint z输出结果为（）。

ABA
BBABBA
C. ABBABA
D. AABAAB

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