单项选择题

有如下程序:

Private Sub Command1_Click()

a$="A WORKER IS HERE"

x=Len(a$)

For i=1 To x-1

b$=Mid$(a$,i,3)

If b$="WOR",Then S=S+1

Next

Print S

End Sub

单击命令按钮,程序运行结果为

A.1
B.2
C.3
D.5