Mark the letter A, B, C, or D on your answer sheet...

Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction: Ernest Hemingway, he is seen as one of the greatest 20th century American novelists, served as an ambulance driver during World War I.

A. he

B. novelists

C. served

D. during