A. leave
B. left
C. leaving
D. None of these
🧠 Explanation:
In the sentence "It is fifteen years since I __ him," the verb "left" completes the temporal expression, indicating a past parting. The structure "it is…since" denotes time elapsed, common in English. Proper verb tense ensures clarity in personal narratives or reflections. This example highlights the importance of temporal grammar in storytelling, vital for clear communication in writing or speaking, particularly in contexts involving past experiences or significant life events.
