3. Our offices are located in an old building on the outskirts of campus that was formerly, a tavern.
Answer: A
Our offices are located in an old building on the outskirts of campus that was formerly a tavern.
The word "formerly" correctly indicates that the building was previously used as a tavern, aligning with the intended meaning of the sentence.
A) formerly
This option is correct as it means "previously" or "in the past," which accurately describes the former use of the building as a tavern.
B) formally
This option is incorrect because "formally" refers to something done according to established forms or conventions, which does not fit the context of describing the previous use of the building.
C) formidably
This option is incorrect as "formidably" means in a manner that inspires fear or respect through being impressively powerful, which is irrelevant to the description of the building's former use.
D) formality
This option is incorrect because "formality" refers to the rigid observance of rules or conventions, which does not apply to the context of describing the past function of the building.
Conclusion
The correct answer is "formerly" because it appropriately conveys that the building was used as a tavern in the past. All other options fail to capture the intended temporal context, making them unsuitable choices for this sentence.