Before he left on vacation, he finished the project.
A.
Before left on vacation, he finished the project.
B.
Before leaving on vacation, he finished the project.
C.
Before on vacation, he finished the project.
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参考答案:
举一反三
【简答题】以下程序段中Do...Loop 循环执行的次数为【 】。程序执行完毕后,n的值为【 】。 Private Sub Command1_Click() n =5 Do If n Mod 2= 0 Then n =n /2 Else n =n* 3 + 1 End If Loop Until n=1 End Sub