Bài tập 5: Điền từ thích hợp vào chỗ trống

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Bài tập 5: Điền từ thích hợp vào chỗ trống

working - known - how - been - had

1. He had notdoing exercise until the doctor reminded him.

2. I had beenin the office for 6 hours before the fire alarm went off.

3. he been eating so much ice cream before his mother finished cooking dinner?

4. long had you been studying at the ABC school before transferring to this school?

5. If I hadhim soon, I would have collaborated with him more at work