When ? - In 1928.penicillin was discovered did penicillin discovered was penicillin discovered did penicillin discover
When _________? - In 1928.
A. penicillin was discovered
B. did penicillin discovered
C. was penicillin discovered
D. did penicillin discover
Đáp án C
=> Khi nào thuốc Pênixilin (thuốc trụ sinh) được phát hiện ra? – Năm 1928.