考研英语中，那些让考生们头疼的难句主要集中在以下几个方面：
1. 复杂的从句结构：包括定语从句、状语从句、同位语从句等，尤其是多层嵌套的从句，如：“It is reported that the project, which was initiated last year, is expected to be completed by the end of this year.”
2. 长难句中的并列句：这类句子由多个并列分句组成，结构复杂，如：“The book is well-written, informative, and entertaining, and it is highly recommended for anyone interested in the subject.”
3. 混合句型：这类句子结合了简单句、并列句和复合句的特点，如：“While the study shows a significant increase in the number of students applying for graduate programs, it also indicates that many of them are unsure about their career paths.”
4. 特殊语法现象：如倒装句、强调句、虚拟语气等，如：“Under no circumstances should you leave your personal belongings unattended.”
5. 难以理解的比喻和隐喻：这类句子往往需要考生具备较强的语感和一定的文化背景知识，如：“The author paints a vivid picture of the rural landscape.”
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