upon
The question asks us to select the most suitable preposition to complete the sentence: "During the course of speech the principal enlarged ____ the need of improving college library." We need to look at how the verb 'enlarge' is used with prepositions.
In English, certain verbs combine with specific prepositions to form phrasal verbs, which often have meanings different from the individual words. The verb 'enlarge' can be used with different prepositions, and the meaning changes depending on the preposition.
In the given sentence, the principal is talking about "the need of improving college library." The context "enlarged ____ the need" implies that the principal spoke in more detail or at greater length about this specific need. This meaning perfectly aligns with the phrasal verb "enlarge upon" (or "enlarge on").
Therefore, the correct preposition to use is "upon". The sentence becomes: "During the course of speech the principal enlarged upon the need of improving college library."
Let's look at the options:
Based on the meaning of the phrasal verb and the context of the sentence, "upon" is the only suitable preposition among the given alternatives.
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