beenThird conditional: "Had the research _____ conducted earlier, many more lives could have survived."Had the research been conducted earlier, many more lives could have survived.NoteHad the research been conducted earlier, many more lives could have survived.Elon.io is an online learning platformWe have an entire course teaching IELTS Vocabulary — Band 7+ grammar and vocabulary.Start learning IELTS Vocabulary — Band 7+ now