Select the most appropriate option to fill in the blanks.
When John arrived ______ the exhibition it was already ______ full swing.

Correct option is A

· The first blank requires a preposition that correctly describes arriving at a specific location, which is best served by "at." "At" is used to indicate presence at a specific point or location.
· The second blank describes a state or condition, which in this case is "in full swing." The phrase "in full swing" means at a high or busy point, and "in" is the correct preposition to denote this condition.
Grammatical Reasoning:
· "at" (first blank): Used for specific places or locations. Example: "I met him at the library."
· "in" (second blank): Used to indicate a state or condition. Example: "The party was in full swing when we arrived."