Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_name_67 (circuit VARCHAR, winning_team VARCHAR, fastest_lap VARCHAR)
### Question:
What circuit did marlboro team penske win with an unknown fastest lap?
### Answer:
SELECT circuit FROM table_name_67 WHERE winning_team = "marlboro team penske" AND fastest_lap = "unknown"