1. He became successful as a professional writer at the age of 20.Đoạn văn36/40Mark the letter A, B, C, or D to indicate the sentence that is closest in meaning. 1. He became successful as a professional writer at the age of 20.He did not succeed as a professional writer until he was 20.He did not write professionally until he succeeded at the age of 20.He succeeded as a professional writer until he was 20.He wrote professionally until he became successful at the age of 20.Giải thíchChọn đáp án A