A dictionary is an useful book.这句话错在哪?

A dictionary is an useful book.这句话错在哪? A dictionary is an useful book.找错 ( )useful book a/an Your dictionary is your useful book. an useful book还是a usefull book? He is rich. He has many money. A dictionary is an useful boo This is ___ useful dictionary .选择：A.an B.a C.the D./ Dictionary is ______ useful tool.A an B a C / D 单项选择 the dictionary is () useful book for studying English. This is__ useful dictionary.填a还是an呢? 是an useful book还是a useful book 加a 或者an 主要看什么 This is ______ useful book. A. a B. an C. the D/