优题课 - 聚名师,上好课(www.youtike.com)
  首页 / 试题 / 高中英语 / 试题详细
  • 科目:英语
  • 题型:单选题
  • 难度:较难
  • 人气:1244

Natural disasters occur at ________ times, so it is always difficult to warn people in advance.

A.random B.exact C.flexible D.absolute
登录免费查看答案和解析

Naturaldisastersoccurattimes,s