Mark the letter A, B, C, or D to indicate the sentence that is best written from the words/ phrases given.Câu hỏi They / live / Moscow/ before / they / move / London. A. They had lived in Moscow before they moved to London. B. They lived in Moscow before they move to London. C. They lived in Moscow before they had moved to London. D. They had lived in Moscow before they had moved to London.