“This is ______ most useful reference book,” a teacher from

“This is ______ most useful reference book,” a teacher from This is so useful a reference book ___we can use while study This is _most useful reference book I have on this subject. This is quite a useful book . This is ______ useful book. A. a B. an C. the D/ This is () useful story book.. there is not much useful information in these reference book The book is ___than that one.A.useful B.the most useful C.mu This is useful book.He wants to buy it at one.A,a quite B,qu A dictionary is an useful book.找错 O_____ ,it is a useful book How useful a book it is!