Trả lời:
1, C - đảo ngữ
2, B
3, C - cấu trúc với wish + V-ed
4, is studied → studies
5, to the problem → of the problem
6, so stubborn a person → a stubborn person
7, bỏ them
8, These vases used to be made by hand. → cấu trúc used to kết hợp bị động
9, Mai last saw her parents when she left for the USA.
→ haven't/hasn't P2... since = last V-ed when
~잘 공부하세요~
@su
$\text{#BTS}$