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题目内容 (请给出正确答案)

下列程序的执行结果为

Private Sub Command1_Click()

Dim s1 As String, s2 As String

s1= "abcd"

Call Transfer(s1, s2)

Print s2

End Sub

Private Sub Transfer (ByVal xstr As String, ystr As String)

Dim tempstr As String

i=Len(xstr)

Do While i >=1

tempstr=tempstr + Mid(xstr, i, 1)

i=i - 1

Loop

ystr=te mpstr

End Sub( )。

A.dcba

B.abdc

C.abcd

D.dabc


参考答案

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