Choose the best answers to complete the following sentences or choose the best rewritten sentences.Câu hỏi “When I was leaving, it started to rain,” she said. A. She said that when she was leaving, it started to rain. B. She said that when she has been leaving, it had started to rain. C. She said that it started to rain when she had been leaving. D. She said that it had started to rain when she was leaving.