以下是一些高中英语作文结尾的高级表达：
1. To sum up, it can be said that…
2. In conclusion, …
3. In the end, …
4. Ultimately, …
5. To conclude, …
6. In summary, …
7. In conclusion, …
8. Having considered all the aspects, we can conclude that…
9. Taking everything into account, …
10. All in all, …
11. Generally speaking, …
12. Over and above everything else, …
13. When all is said and done, …
14. At the end of the day, …
15. In the final analysis, …
16. From the above discussion, it can be inferred that…
17. Based on the arguments presented, …
18. It goes without saying that …
19. The bottom line is that …
20. Without a doubt, …
这些表达可以帮助您在高中英语作文中表达您的观点，并使您的结尾部分更具深度和说服力。请根据您的文章内容和观点选择合适的结尾表达。