since的问题5.-Do you smoke?-No,I don't.But I used to.It's two years since I ______ .A.smoked B.didn't smoke C.have smoked D.began to smoke为何不是完成时?

since的问题5.-Do you smoke?-No,I don't.But I used to.It's two years since I ______ .A.smoked B.didn't smoke C.have smoked D.began to smoke为何不是完成时? “What do you do since your English is so good?”该怎么翻译?特别是中间的“since”是翻译成“自从”还是“因为”?谢谢了. 友友们帮忙用英语回答下问题哦～～一：What factors may weaken one's memory? 二：What courses are useful for one's job? 三：Why do you think some people smoke ? What are the disadvantages of sm 翻译一句话：Since when do you make mistakes? What _you_ _(do)since I last saw you? sm同志小说要bt sm sm 最好有用工具的 韩国SM公司的SM是什么意思 ever since的用法及时态问题 sm开头的英语单词 SM的含义 SM的作用? 含有“sm”的单词. SM的全称是什么? “SM”的全称是什么? 白痴的英语问题：是Which class do you like?还是 Which classes do you like? 陈述语序的问题do you kown why did she----还是do you kown why she ----- 翻一下下面的句子：How do you just don't know? Since you think so let me hurt, then I scarred come to see you!什么意思 高二英语时态的动词填空问题.1.Food _____(need) in the morning because you ____(have) nothing to eat the whole night.2.-Mr.Zhang hasn't come to work since last week. -Where do you think he ______(go)?3.How _____ you _______(get)along with