Tìm lỗi sai trong các câu dưới và sửa lại cho đúng.
1. The telephone rang several times and then stop before I could answer it.
A. times B. then
C. stop D. could
2. When I'm shopping in the supermarket, I ran into an old friend who I hadn't met for fives years.
A. I'm shopping B. into
C. hadn't met D. for
3. Frank is usually swimming before work, but this morning he is jogging.
A. is usually swimming B. work
C. but D. is jogging
Giải thích giúp em câu số 2 với ạ.
Loga
Sinh Học lớp 12
