21.( ) 執行下列Visual Basic程式片段後，A(0)-A(5)的值為何？
Dim a(5), i , b As Integer
a(0) = 27 : a(1) = 12 : a(2) = 8
a(3) = 9 : a(4) = 21 : a(5) = 72
For i = 0 To 2
b = a(i)
a(i) = a(5 - i)
a(5 - i) = b
Next i
(A)27,12,8,9,21,72
(B)72,27,21,12,9,8
(C)72,21,9,8,12,27
(D)8,9,12,21,27,72。
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