For years, it was viewed as a

首页 / 试题 / 高中英语 / 试题详细

科目：英语
题型：单选题
难度：中等
人气：1740

挑错有奖加入试题篮

题文

For years, it was viewed as a serious problem, ________ that has never been really solved.

A．one

B．where

C．it

D．which

登录并查看解析

相关知识点

与数量有关的代词和限定词

推荐试卷

热门试卷