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1.How long dose a jacket like this last me? _______________________ （这要看你多长时间穿一次）.
2. The theory he advanced has proved _________________ （对许多传统概念的一种挑战）.
3. The manager ___________________ （本可以亲自参加会议）,but he was called away for some urgent business abroad.
4. Both research and practical experience have shown that a __________________ （均衡的饮食对健康是必不可少的）.
5. Much ____________________ （我感到遗憾）, I was unable to finish the work on time.
答案与解析：
1.It depends on how often you wear it
2. (to be )a challenge to many traditional notions / concepts.
3.could have attended the meeting in person/by himself
4.a balanced diet is essential to health.
5.regretted as I felt
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