---Which book do you think is the most useful to my studies?--- as long as you read it. I

问题补充：

---Which book do you think is the most useful to my studies?

---, as long as you read it. In fact, they are out of date.

A. None

B. Neither

C. Any

D. Either

答案：

(答案→)A. None

B. Neither

C. Any

D. Either

解析：考查不定代词词义辨析。A（三者）都不；B（两者）都不；C（三者中）任何一个；D（两者中）一个。根据语境“the most”可知是三者（以上），再根据答语“In fact, they are out of date.”可知“都不喜欢”，“三者都不”要用none, 故选A。句意：——你觉得哪本书对我的研究最有用？——只要你读一读，这些书都没有用。事实上他们都过时了。