输入学生成绩(百分制),判断该成绩的等级(优、良、中、及格、不及格)。 功能要求:用户从“成绩”文本框(Text1)中输入学生成绩,单击“执行”按钮(command1)后,经判断得到等级并显示在标签Label2上。请将空格部分补充完整。 Private Sub command1_click() Dim score As Integer, temp As String score = temp = "成绩等级为:" Select Case score Case 0 To 59 Label2.Caption = temp + "不及格" Case Label2.Caption = temp + "及格" Case Label2.Caption = temp + "中" Case 80 To 89 Label2.Caption = temp + "良" Case 90 To 100 Label2.Caption = temp + "优" Case Label2.Caption = "成绩出错" End Select End Sub