This problem ________ addressed by several authors [Blake, Milton, Holt], but so far no one _________ to find a complete solution.
A、was… / managed
B、 has been…/ has managed
学术英语论文写作

章节列表

Chapter 2 Introduction to Academic Writing3Chapter 3 Citation and Plagiarism9Chapter 4 Textual Development at the Lexical Level16Chapter 5 Sentence Structure5Chapter 6 Writing a Paragraph7Chapter 7 Common Types of Short Academic Essay4Chapter 8 Shaping your Topic and Structure13Chapter 9 Writing Introduction and Method1Chapter 10 Writing Results and Conclusion2Chapter 11 Writing Abstract and Key Words4Chapter 12 Paper Publication5Final Exam32