Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction:
Who was the opponent before week 8 when the result was l 28-17?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Opponent', 'Result', 'Attendance']

### Response:
SELECT Opponent FROM table WHERE Week < 8 AND Result = l 28-17