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

### Instruction:
Who was the opponent at the Steelers game that had a result of l 20–17?

### Inputs:
table_name: table, columns: ['Week', 'Date', 'Kickoff ( ET )', 'Opponent', 'Result', 'Record', 'Game Site']

### Response:
SELECT Opponent FROM table WHERE Result = l 20–17