EXERCISE 12. MARK THE LETTER A, B, C, OR D TO INDICATE THE SENTENCE TH...

134. 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.