This film is familiar ........me. I think I had watched it before.
a) to b) with
I go for 'b'. In fact the difference between 'familiar to' and 'familiar with' is not clear to me. I hope you will explain it.
This film is familiar ... to. me.
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This film is familiar ...to.....me. I think I have seen it before This sounds like you are saying this while you are are sitting in the cinema.
This film was familiar ...to.....me. I think I had seen / saw it before. This sounds like you are saying this after the film has finished.
The verb 'see' is more idiomatic than 'wat