[单选题]

( 30 )下面程序的输出结果是

Private Sub Command1_Click()

ch$= ” ABCDEF ”

proc ch

Print ch

E.nd Sub

Private Sub proc(ch As String)

S= ””

F.or k=Len(ch) To 1 Step-1

s=s&Mid(ch,k,1)

Next k

ch=s

E.nd Sub

A. ) ABCDEF

B. ) FEDCBA

C. ) A

D. ) F

参考答案与解析:

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