启教通信息平台
  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:494

The school has developed an on­line system________ students can choose their own teachers.

A.which B.when C.that D.where
登录并查看解析

The school has developed an on