t = a(1)
For i = 2 To n
b = a(i)
c = t
Do While c Mod b <>0
r = c Mod b
Loop
Next i
上述程序中方框处的可选语句为:
① b = r :c = b ② c = b :b = r
③ t= a(i) * t / c ④ t = a(i) * t / b
则方框处语句依次是( )
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