Maybe an interesting book isn't always ______ useful one.A.a B.an C.the D/
问题描述：
Maybe an interesting book isn't always ______ useful one.A.a B.an C.the D/
答
选A
首先根据后边的one可以排除D,然后根据useful发音排除B,最后因为本句并没有特指哪一本书,因此排除定冠词那一项C,所以选A
翻译：也许有趣的书并不总是有用的书.