This book is useful to me,so I _____ 20 yuan on it yesterday.

This is () useful story book.. This is （ ） useful book．（填冠词） useful,book,is,to,you,this连词成句 （ ）useful book it is This is _most useful reference book I have on this subject. this is the ____(useful) book l bought in this bookstore. This is ______ useful book. A. a B. an C. the D/This is ______ useful book.A. a B. an C. the D/要解释 this is （）interesting book and it is also （）useful one. This is quite a useful book .解释一下quite为什么放在 a前面,useful是什么意思,为什么不定冠词不使用an? It is a useful science book Jenny looks beautiful in this red skirt 改为感叹句 This book is useful to me,so I _____ 20 yuan on it yesterday. This is an useful book.You'd better read it carefully.修改病句 This is an useful book .You must read it carefully .哪里错了? O_____ ,it is a useful book the book is very useful 感叹句 英语：改为同意句How useful the book is!It is _____ _____ useful book. “This is ______ most useful reference book,” a teacher from ______ European country told us in cla a This is _____ useful book.I read _____ book every day.[ ]A.an,/ B.an,the C.a,the D.a,a