He became successful as a professional writer at t...

Câu hỏi: 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.