UP TO KNOW, __________.A. THERE HAS BEEN NO PROGRESS IN AIDS TREATM...

1. - 20 DE TRAC NGHIEM TIENG ANH
20 DE TRAC NGHIEM TIENG ANH
1. Up to know, __________.a. there has been no progress in AIDS treatmentb. there has been some progress in AIDS treatment and prevention.c. we have known nothing about AIDSd. AIDS has not spread in Asia