题目

执行各选项的VB程序段后，变量s的值为“99以内所有正偶数之和”的是（  ） A . S=0 For i = 2 To 99 Step 2 s = s + 2 Next i B . For i = 2 To 98   s = s + i   i = i + 2 Next i C . s = 0 Do While i<= 98   i = i + 2   s = s + i Loop D . i = 2 Do While i<100   s = s + i   i = i + 2 Loop 答案：D

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