Câu 22 (TH): Her academic performance has greatly improved since she ……………. her study methods.
A. changed
B. will change
C. would change
D. was changing
Giải bởi Vietjack
Câu 22: Đáp án A
2 mệnh đề được nối với nhau bằng “since”:
- Mệnh đề trước “since” chia thì hiện tại hoàn thành: S + have/has + P2
- Mệnh đề sau “since” chia thì quá khứ đơn: S + V-ed/V cột 2
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