Difficulty: Easy
Correct Answer: saw
Explanation:
Given data
Concept/Approach
In standard English, since is followed by the simple past to mark the starting point in time: “It is 14 years since I saw him.”
Option analysis
saw — correct simple past.have seen — present perfect after since is nonstandard in this construction.had seen — past perfect needs a past reference point; incorrect here.see — base form; ungrammatical.
Final Answer
saw
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