下列4种形式的循环设计中，循环次数最少的是

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a=5:b=8
Do
a=a+1
Loop While a＜b  a=5:b=8
Do
a=a+1
Loop Until a＜b  a=5:b=8
Do Until a＜b
b=b+1
Loop  a=5:b=8
Do Until a＞b
a=a+1
Loop

a=5：b=8 Do a=a+1 Loop While a＜b a=5：b=8 Do a=a+1 Loop Until a＜b a=5：b=8 Do Until a＜b b=b+1 Loop a=5：b=8 Do Until a＞b

a=5:b=8
Do
a=a+1
Loop While a＜b  a=5:b=8
Do
a=a+1
Loop Until a＜b  a=5:b=8
Do Until a＜b
b=b+1
Loop  a=5:b=8
Do Until a＞b
a=a+1
Loop

1 2 不定

a=5:b=8 Do a=a+1 Loop While a＜b a=5:b=8 Do a=a+1 Loop Until a＜b a=5:b=8 Do Until a＜b b=b+1 Loop a=5:b=8 Do Until a＞b a=a+1 Loop

1 2 不定

a＝5:b＝8 Do a＝a+1 Loop While a＜b a＝5:b＝8 Do a＝a+1 Loop Until a＜b a＝5:b＝8 Do Until a＜b b＝b+1 Loop a＝5:b＝8 Do Until a＞b a＝a+1 Loop

a=5:b=8 Do a=a+1 Loop While a＜b a=5:b=8 Do a=a+1 Loop Until a＜b a=5:b=8 Do Until a＜b b=b+1 Loop a=5:b=8 Do Until a＞b a=a+1 Loop

a=5:b=8 Do a=a+1 Loop While a＜b a=5:b=8 Do a=a+1 Loop Until a＜b a=5:b=8 Do Until a＜b b=b+1 Loop a=5:b=8 Do Until a＞b a=a+1 Loop

1 2 不定

a=5:b=8 Do a=a+1 Loop While a＜b a=5:b=8 Do a=a+1 Loop Until a＜b a=5:b=8 Do Until a＜b b=b+1 Loop a=5:b=8 Do Until a＞b a=a+1 Loop

a=5:b=8 Do a=a+1 Loop Wbile a＜b a=5:b=8 Do a=a+1 Loop Until a＜b a=5:b=8 Do Until a＜b b=b+1 Loop a=5:b=8 Do Until a＞b a=a+1 Loop

a＝5:b=8 Do a＝a+1 Loop While a＜b a＝5:b＝8 Do a＝a+1 Loop Until a＜b a＝5:b＝8 Do Until a＜b b＝b+1 Loop a＝5:b＝8 Do Until a＞b a＝a+1 Loop