在窗体上添加一个R命令按钮，名称为Command1,然后为该命令按钮编写如下事件过程，该过的执行结果为( )。
Option Base 1
Private Sub Command1_Click()
Dim a As Variant
a=Array(1,2,3,4
j=1
For i=4 To 1 Step-1
s=s+a(i)*j
j=j*10
Next
Print s
End Sub

A) a=5:b=8
Do
Print
a=a+1
Loop While a＜b
B) a=5: b=8
Do
“*”
a=a+1 Loop Until a＜b
C) a=5: b=8
Do Until a-b
Print“*”
b:b+1
Loop
D) a=5: b=8
Do Until a＞b
Print“*”
a=a+’1
Loop

A=“ABBACDDCBA”
For i=6 To 2 Step-2
X=Mid(A,i,i)
Y=Left(A, i)
Z=Right (A,i)
Z=X&Y&Z
Next
Print ZA) ABC
B) AABAAB
C) BBABBA
D) ABBABA