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求助：写硕士毕业论文急需三篇文献！先谢谢了！ 我的邮箱：lufang0521@gmail.com Bardovi Harlig, K., & Bofman, T. (1989).Attainment of syntactic and morphological accuracy by advanced language learners. Studies in Second Language Acquisition. Cooper, T. C. (1976). Measuring written syntactic patterns of second language...

请教各位老师，有些特别需要的文章想从sciencedirect网站上下载，但是那个网站是收费的呀，我怎么都下不到，请问有什么办法吗？现在急求两篇文章： Saxton, M.(1997) The contrast theory of negative input. Bardovi-Harlig,K. (1994) Anecdote or evidence? Evaluating support for hypotheses concerning the development of tense and aspect. 语言学菜鸟，还不太懂学术搜索，恳请指教！