درس 1: Sense of Appreciation
زبان انگلیسی (3)
دوازدهم
دوره دوم متوسطه- نظری
علوم ریاضی
درسنامه آموزشی این مبحث
Antibiotics ……. until the 1800s, and it was almost impossible to cure diseases without them.
weren't inveted
2 )
had not invented
3 )
have not been invented
4 )
weren't going to be invented