have you seen(a)book?i left it here a moment ago能不能解释清楚为什么是a啊,后面不是特指了吗

have you seen a book ( )a yellow cover?A hasB haveC withD had have you seen a book ___ cover is green?A,which B,whoes 选什么?为什么? have you seen a book ___ cover is green?A,which B,whoes 选什么?为什么? Have you seen my english book?啥意思 初中英语作文 关于书,CD,电影的write a review of a book you have read,a CD you have listened to or a movie you have seen Write a review of a book you have read ,a CD you have listened to or a movie you have seen不想写的死远点 Excuse me ,have you seen ______ English book I put it here just now.A an B the 选哪一个? Have you a new book? Have you seen such a film! Have you seen a movie I told 英语..用所给的词`组成句子..``..1.I,a,by.read.have.bing xin.book.2.you.time.have't.l.long.a.seen.for 八年级英语题目求解答hi bob! i can't find my history book . have you seen it___?-sorry,i have't . why don't you ask Jim?Perhaps he's seen it.A somewhere Beverwhere C nowhere Danywhere hi bob!i can't find my history book .have you seen it___?-sorry,i have't .why don't you ask Jim?Perhaps he's seen it.A somewhere Beverwhere C nowhere Danywhere have you seen anything Have you seen John? 新目标九年级unit6 3c新目标九年级P48页,3c怎么写?write a review of a book you have read ,a CD you have listenedto or a movie you have seen.至少用两个 定语从句。 have you seen(a)book?i left it here a moment ago能不能解释清楚为什么是a啊,后面不是特指了吗 peter ,i haven't seen you for a long time.oh,i （ ）a book these days.A.am writing B.have written C.wrote