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.

Question 43. The (A) discovery of penicillin in 1928 (B) has not produced antibiotics (C) useful for the treatment of (D) infectious diseases until 1940.

A. discovery                         B. has not produced          C. useful                           D. infectious

Question 44. The Mississippi, the (A) longest river in the USA, begins (B) as small (C) clear stream in (D) northwestern Minnesota.

A. longest                             B. as small                         C. clear                              D. northwestern

Question 45. (A) Before the invention of (B) the printing press, books (C) have been all printed (D) by hand.

A. Before                              B. the printing                   C. have been                     D. by hand

3. Đề thi thử THPT 2021 - Tiếng Anh - Nhóm GV MGB - Đề 3 - có lời giải