分类：教育/科学-外语学习-英语考试
问题：Whodidtheteacher_____thearticle?? 
 Who did the teacher _____the article?              A. have wrten         B. have write              C. had written           D. has writing
回答：Whodidtheteacher_____thearticle?A.havewrittenB.havewriteC.hadwrittenD.haswriting本题选B。你可以这样理解:Theteacherhadwhowritethearticle.本题实际考察的是 sth.的结构。