The preposition “for” is used to indicate a duration of time. In this sentence, it correctly expresses that the rain has continued over the span of one hour.
It has been raining _____ an hour.
Review the verified answer and explanation for this ASF Airports Security Force past-paper question on CampusFin.
Question context
This question is part of 🗣️ Verbal Ability within the broader 🧠 Aptitude Mastery subject and appears in the ASF Airports Security Force preparation collection. Reviewing the answer together with nearby questions helps reinforce the underlying concept and identify how it may appear in competitive exams.