Answer:
- He was carried to the village's foremost occult healer who alone knew how to cure lunatics.
Explanation:
The grammatical structure that is being outlined in the given sentence is 'who alone knew how to cure lunatics.' The relative pronoun 'who' assists in providing information regarding an antecedent or referent mentioned previously i.e. 'foremost occult healer.' Thus, this forms the relative clause followed by an adverbial clause('how to cure lunatics') that functions to provide additional details about the noun and the verb to the reader. Therefore, the underlined grammatical structure is 'who alone knew how to cure lunatics.'
