Mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the following questions.

Câu hỏi

- “When_______?” -“In 1928.”

A. penicillin was discovered

B. penicillin discovered

C. was penicillin discovered

D. did penicillin discover

Đáp án
C. was penicillin discovered

Câu hỏi thuộc Bài tập:

E9- Vào 10- Đề ôn 20