6058 - Elementary / Pre-Intermediate Test:3 - A: Who discovered penicillin? B: ______?

A: Who discovered penicillin?
B: ______?
It has been discovered by Fleming
It was discovered by Alexander Fleming
Alexander Fleming may discover penicillin
Penicillin was discovered by him
Table of English Grammar Contents (All Levels)
Fiverr 2021 English Level Tests
Pre-Intermediate Grammar Exercises
Upper-Intermediate Grammar Exercises