A. was
B. at
C. on
D. Is
🧠 Explanation:
He may be slow at understanding, using the correct preposition. For English students, this highlights grammar, making it a key topic for studying linguistic clarity, communication, and writing. Prepositions clarify meaning. Understanding this improves writing precision. It’s essential for mastering grammar in communication. Studying prepositions offers insights into how language conveys relationships, crucial for English, communication, and writing.
