PENICILLIN IS PERHAPS THE DRUG _______ MORE LIVES THAN ANY OTHER...

612. - LUYEN THI TOIEC 870 CAU TRAC NGHIEM
LUYEN THI TOIEC 870 CAU TRAC NGHIEM
612. Penicillin is perhaps the drug _______ more lives than any other in the history of medicine. (A) what has saved (B) which saved (C) which has saved (D) who saves