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Option 3 : If i had known
The correct answer is option 3.
There is an error in the underlined part of the sentence and it should be replaced with 'if i had known'.
Sub + would + have + V₃ (3rd form of verb) + . . . . . . . . . if + had + V₃ (3rd form of verb) + ……
This is the correct structure of the sentences like above format.
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