Maybe an interesting book isn't always ______ useful one.A.a

Maybe an interesting book isn't always ______ useful one.A.a ( )useful book a/an an useful book还是a usefull book? That's an interesting story ,_______? A.isn't it B.isn't tha A dictionary is an useful book.找错 This is ______ useful book. A. a B. an C. the D/ There is a interesting book.还是an interesting book? I think the book is hardly interesting,( )?A.isn't it B.is i 选择：I ___ this book ___ interesting.A.think,not B.think,isn't 是an useful book还是a useful book 加a 或者an 主要看什么 useful one前用an还是a Tom isn't a student,______ an English teacher