A、If score>=90 Then Mark="優(yōu)秀" ElseIf score>=75 Then Mark="良好" ElseIf score>=60 Then Mark="及格" End If B、If score>=60 Then Mark="及格" ElseIf score>=75 Then Mark="良好" ElseIf score>=90 Then Mark="優(yōu)秀" C、If score>=90 Then Mark="優(yōu)秀" If score>=75 Then Mark="良好" If score>=60 Then Mark="及格" D、If score>=60 Then Mark="及格" ElseIf score>=75 Then Mark="良好" ElseIf score>=90 Then Mark="優(yōu)秀" End If