Hi, I think it's definitley "was". The other, "were", doesn't make sense there. There are no conditionals, so it's just a past tense.
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Diego SimãoThere is a sentence in My extracurricular English book:The verb should be 'was' so that it is in agreement with 'It'. (It was ... )
It were Mike and Madeleine that went into the room.
I think it should be "were".