English Grammar: Preposition Choice for 'Dream' - It Goes Without Saying

The correct answer is D. The phrase "dream of" is a common collocation in English, meaning to imagine or think about something that is not real. So the complete sentence is: "It goes without saying that a real sportsman will never dream of cheating in a game." The other options are incorrect because they don't form natural collocations with 'dream'. For example, "dream to cheat" doesn't make sense in this context.