Question

if i would have realized the nature of job earlier ,i would not have accepted it
1-if I have had 2-in case I would have 3-had I been

Answer 1

I think it's the 1st option. If I have had realised the nature of job earlier, I would not have accepted it

Answer 2

Option1: If I would have realized the nature of the job earlier, I would not have accepted it. Option2: In case I would have realized the nature of the job earlier, I would not have accepted it.

The third option "had I been" is not legitimate or appropriate in the context of the sentence provided.

Option1 and Option 2 are grammatically sound and viable options. The most preferred choice would be Option 1.