Of all the bakers, Salma alone uses the stone oven. Provide only the standard simple-present form of use: Salma is the only one of the bakers who ___ the stone oven.

توضیح

Uses is singular because the opening premise makes Salma alone the antecedent of who. Use would attach the relative clause to the plural bakers, a defensible structure in another context but one that contradicts the meaning fixed here.