__ course of time, he became a famous writer.

Correct Answer: (A) In Preposition usage is one of the most tested grammar points in NTRCA English sections. Analysis: The correct phrase is: "In the course of time" Meaning: gradually, over a period of time; eventually Why "In" is correct: — "In the course of" is a fixed prepositional phrase meaning "during the process/passage of" — It indicates a span or passage of time — Examples: → "In the course of time, the wound healed." → "In the course of his career, he won many awards." Other fixed phrases with prepositions: — "In the end" (eventually) — "In time" (not too late) — "On time" (punctually, at the exact moment) — "For a while" (for a short period) — "By the time" (before a certain moment) Why others are wrong: ✗ "Of course of time" — not a standard phrase ✗ "For course of time" — unnatural ✗ "By course of time" — incorrect Source: English Idioms and Phrases; NTRCA Question Bank.