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有如下VB程序段:
i = 0: j = 1
Do While j <= 5
If a(j) <> 0 Then i = i + 1: a(i) = a(j)
j = j + 1
Loop
For j = i + 1 To 5
a(j) = 0
Next j
数组元素a(1)到a(5)的值依次为“0,20,0,4,31”,执行该程序段后,a(1)~a(6)各元素的值依次为(   )
A.4,20,31,0,0B.31,20,4,0,0C.0,0,20,4,31D.20,4,31,0,0
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