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【单选题】
下列程序的执行结果为 Private Sub Command1_Click( ) Dim FirStr As String FirSt=”abcdef， Print Pat(FirStr) End Sub Private Function Pat(xStr As String)As String Dim TempStr As String，strLen As Integer tempStr=”” strLen=Len(xStr) i=1 Do While i＜=Len(xStr)-3 tempStr=tempStr+Mid(xStr，i，1)+Mid(xStr，strLen-i+1，1) i=i+1 Loop Pat=tempStr End FunctionA.
abcdef
B.
aPDecd
C.
fedcba
D.
defabc
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