The research team surveyed ten couples over 20 years.
举一反三
- Zhang Qian’s team set out in . They were captured by the Huns and held under house arrest for over ten years.
- I __________ ( live) here for over ten years.
- The machine needs a complete _____since it has been in use for over ten years.
- The machine needs a complete _____since it has been in use for over ten years.</p></p>
- Rip Van Winkle had been sleeping for_______. A: five years. B: ten years. C: Twenty days. D: Twenty years