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The answer to your question would be that the sentence that contains a verbal phrase acting as a noun is the following one: My objective was writing an eloquent speech.
In this case, the verbal phrase "writing an eloquent speech" is a gerund that acts as the subject complement. A subject complement is the adjective, noun, or pronoun that follows a linking verb.
There are sentences that contain verbal phrases which can act as a noun. Such sentence that contains a verbal phrase acting as a noun is: My objective was writing an eloquent speech.
What is verbal phrase?
Verbal phrase is known to be a group of words that includes a verb and its complements, objects, which actually functions syntactically as a verb.
We can see that the verbal phrase here is "...writing an eloquent speech". It's a gerund.
Learn more about verbal phrase on https://brainly.com/question/1285501