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.
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Đáp án: A
Giải thích: Ông trở nên thành công như một nhà văn chuyên nghiệp ở tuổi 20.