----- Nội dung dịch tự động từ ảnh -----
12. When did you begin to do research on lung cancer?
→How long
TH2: Nhận biết: last↔haven’t/ hasn’t
Stopped → haven't/hasn't
1.She last swam in the river 3 years ago.
She
2.I last visited the city museum 5 years ago.
>I
3. I haven't attended the club since 1988.
→I last
4. She hasn't seen him for 2 months.
She last
5.My father stopped smoking two years ago.
dovo
→ My father hasn't...pake for deva year
The last timehaven't/ hasn't