by He became successful as a professional writer at the age of 20.
A. He did not succeed as a professional writer until he was 20.
B. He did not write professionally until he succeeded at the age of 20.
C. He succeeded as a professional writer until he was 20.
D. He wrote professionally until he became successful at the age of 20.
Xem đáp án
Đáp án: A
Giải thích: Ông trở nên thành công như một nhà văn chuyên nghiệp ở tuổi 20.
