主题：[求助]修改列表达式

要求：>= 90,'特优'　<90 and >=80 ,'优秀‘,　<80 and >=70 ,'良好‘,　<70 and >=60 ,'及格‘,　<60,'不及格‘

Dim a As Integer = 10

Dim b As String=iif(a>=90,"特优",iif(a<90 And a >=80,"优秀",iif(a<80 And a >=70,"良好",iif(a<70 And a>=60,"及格","不及格"))))

Output.Show(b)