درس 1: Sense of Appreciation
زبان انگلیسی (3)
دوازدهم
متوسطه دوم 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