Question 6: _________, sheep were then used for wool.
A. Having first domesticated for milk production
B. Having been first domesticated for milk production
C. Because they had been first domesticated for milk production
D. Although they had first domesticated for milk production
1000 câu khó mục tiều 9+ Tiếng anh ôn Tốt nghiệp THPT Quốc Gia (Lesson 7)