英语考研语法长难句推荐如下：
1. 结构复杂型：The complex sentence structure, with its myriad clauses and subordinate phrases, can often challenge even the most diligent students.
2. 倒装句型：Not only was the experiment groundbreaking, but it also provided significant insights into the subject matter.
3. 强调句型：It is the depth of understanding that truly sets apart the accomplished researcher from the beginner.
4. 虚拟语气：Had the project been completed on time, the results would have been invaluable for future research.
5. 非限定性定语从句：The novel, which was published in 1925, remains a cornerstone of modern literature.
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