the book was written in 1946,{since when }the education system has saw great changes.逗号后面引导一个非限制性定语从句,以介词since开始,这不是介词+which的形式吗?为什么用when?选项since then为什么不对?

by who was the book written Who do you think _ A did the book write B was the book written C was the book written byA did the book writeB was the book writtenC was the book written byD the book was written by written by 和written的区别Who was the book written 后面为什么不能加by? A book was written on the subject.He has written a book on this subject.时态? who was the book written by、这个句子对吗 Who was the book---?A.wroteB.writtenC.written The book was written ( )LuXun (介词填空） The book was written by him 变为Who____________________ who was the book weitten by?和whom was the book written by?有什么区别? Whom was the book---?Who was the book---?A.wroteB.writtenC.written by选B对吗? Who was the book( A.write B.wrote C.written D.written by The book ____ (write) by Bill Gates in 2002.是 is written 还是 was written .The book _____ by Luxun is very famous.( write ) 为什么填written而不是was written Many students enjoy the book Harry Potter ( )by JK Rowling.A written B was written C wrote D was writing I borrowed a book()by J.K.Rowling from the library last week.A written B was written The book was written in 1946,( )the education system has witnessed great changes. Here is a note book,in which _______ the names of the visitors.A.write B.written C.were written D.was written the book is written in german 与 the book was written in german 有什么区别吗?翻译成中文又是怎么样的?