Question

【题目】We have tried several ways to solve the problem, but _________ of them works.

A. bothB. allC. neitherD. none

Answer 1

【答案】D

【解析】

句意：我们试过几种方法来解决这个问题，但都不管用。考查不定代词。A. both（两者）都；B. all（三者及以上）都；C. neither（两者）都不；D. none（三者及以上）都不。根据several ways（几种方法）结合句意可知填none；选D。