A. Has been
B. Has
C. Were
D. Then
🧠 Explanation:
The correct sentence is “Not only the teacher but also the students were laughing.” The subject “Not only the teacher but also the students” is plural, requiring the plural verb “were.” This construction follows the subject-verb agreement rule, ensuring grammatical accuracy. The phrase uses correlative conjunctions to emphasize multiple subjects performing the same action. Proper verb agreement is essential in English for clarity and correctness, particularly in complex sentences. Mastering this rule enhances communication in writing and speech, ensuring precision in academic, professional, and everyday contexts where clear expression is critical.
