The correct answer is 'knew'. Key Points - In this sentence, we need a past tense form of the verb 'know'. - The option 'know' is incorrect because 'know' is in the present tense. - The option 'have known' is the incorrect answer because the given statement is in the past tenses and 'have known' is the Present Perfect Tense of the verb 'know'. - The option 'knew' is the correct answer because 'knew' is the Past Tense of the verb 'know'. - The option'known' is incorrect because 'known' is the Past Participle form of the verb 'know'. - Hence, the correct form of tenses, 'knew' should be used to make the sentence grammaticallycorrect. - Hence, the correct answer is 'knew'. Correct sentence: I wish I knew her before we met.
