When were books first _____________(发明)

When were books first _____________(发明) when were the books sold out the books是什么成分 When and where were the books found?改成主动语态 When her books were broken,she fix them and tidy them up very carefully. What were you doing when I was p on the books? I （like） these books very much.when were they（ bought）为什么可以这样填空?为什么是“when were they（ bought）”而不是“when did they bought? When he got home ,he found that the books he put on the table_____.A.missedB.missingC.were missingD.miss The first time __i met her,she were in __possession of over 500 volumes of books.A when / B / / C as the D when the when you were my When were you born? When You Were My When they were when you were sleeping when were you young when we were young Jocelyn didn't have many friends, but she had lots of books. Books were (1)read, exciting, think, why, different, good, when, how, travel, they, share, so Jocelyn didn’t have many friends, but she had lots of books. Books were (1)_________ than fri 把下列被动句变成主动句 1.When will the work be finished by him?2.How many books were sold by you last week? when were you born=when is ( ) (