Mark the letter A, B, C, or D on your answer sheet to indicate the underlined part that needs correction in each of the following questions.
(A) After writing it, the essay must (B) be duplicated by the student himself and handed (C) in to the department secretary before (D) the end of the month.
A. After writing it
B. be
C. in to
D. the end of
Chọn A