It is 'would be a bore' That sounds like a past and possibilty. I think you can use 'have been a bore' in below. If it was not for the remarkable opening passage, I could assume that the recital would have been a bore.
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MarvinTheMartianI can't make up my mind which tense to use in the following sentence:
"If it hadn't been for the remarkable opening passage, I would have assumed that the recital would be / have been a bore.
I've seen both tenses used in similar constructions. Is it safe to assume that both options are correct in this case? If not, is there