It was the first time that Tom        in the math exams. [ ]

A. have failed      

B. had failed        

C. failed          

D. has failed

下列程序的功能是：单击窗体时将随机生成20个两位数依次赋值给一个由20个元素组成的数组，然后把数组反序存放，再输出。
Option Base 1
Private Sub Form_Click()
Dim a(20) As Integer,i As Integer
Dim t As Integer,j As Integer
Randomize
For i=1 To 20
a(i)=10+Int(90*Rnd)
Print a(i)；
Next i
Print
i=1： 【9】
Do While i＜j
t=a(i)： 【10】 ：a(i)=t
i=i+1：j=j-1
Loop
For i=1 To 20
Print a(i)；
Next i
Print
End Sub