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跟据所给单词完成句子 1. She _____ _____(forget) to bring her homework to school before the teacher called her parents. 2. When we got to the airport, the plane _____ _____(left). 3. I _____ _____(live) in Beijing for ten years before I came here. 4. Hello, I _____ _____(not know) you ______(be) in London, How long have you been there?