AS i was writing a letter ,Robert is came to visit me.为什么前面用过去进行时,后面用过去时

As I __a letter to my teacher,Robert __to visit me.A was writing; came B wrote; cameC was writing; was coming D wrote; was coming I was taking notes _____ you were writing on the blackboard.A.as B while C.after D.before I was under the impression that he was a very slow boy ____ h succeeded in writing a big book.A.when B.after C.as D.until a,letter,was,just,i,now,writing怎么写 a,letter,was,just,i,now,writing怎么写 I hear Mr.Smith was writing a story last year and he still _____.A do B does C is D as选哪个?为什么? AS i was writing a letter ,Robert is came to visit me.为什么前面用过去进行时,后面用过去时 As a t______ musician,Mozart began writing music when he was only fuor.根据 When I was about twelve,I suddenly developed a great passion for writing poetry.I 21 all my other hobbies,such as collecting stamps,and spent all my spare time reading poetry and writing it.This habit of writing poetry 22 every possible occasion soon I ________ novels when I was in his age．A.used to writing B.used to write C.was used to write D.was used to writing I was writing a report last night; ________ I would not have stayed up late. When I _ the letter,he _to visit us?A.wrote;cameB.was writing;C.was writing;cameD.wrote;was coming i am reading,not ___A am writing B write C writing D was writing选哪个,为什么为什么不选A呢 用since,as,when,as soon as,while,if,after,before,until或because 填空.1.He asked me another question ( ) I could answer the first one.2.I was doing my homework ( ) suddenly a dog came in.3.The students sang ( ) they went along.4.( ) I was writing 英语翻译Amanda Hocking's parents divorced when she was young.Money was tight and there was no cable TV at home.“So I read a lot and took up writing as a child,” she recalled.The first novel Dreams I Can't Remember was written when she was 17. -Do you know any idea what Paul does all day?-As i know,he spends at least as much time playing as he_.A.writes B.does writing C.is writing D.does write为什么是does writing I'm writing a letter I was writing a letter ,He was reading a newspaper（用适当的连词连成一个复合词语）