Question

complete the sentence with the best relative pronoun. the keynote speech, celine delivered, was full of practical advice for small - business owners.

Explanation:

This is a question about relative pronouns in English grammar. The sentence has a non - restrictive relative clause. The先行词 (antecedent) is "the keynote speech", which is an object in the relative clause "Celine delivered". In non - restrictive relative clauses, when the antecedent is an object, we can use "which" as the relative pronoun. "That" is not used in non - restrictive relative clauses, and "who" is used for people, not things. So the appropriate relative pronoun here is "which".

Answer:

which