The book which x by a famous author has become the best seller42/80Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions. The book which x by a famous author has become the best seller. is writing has written was written wroteGiải thíchĐáp án là C. Mệnh đề quan hệ phải ở dạng bị động, vì thấy có “by a famous author”.