首页 / 高中英语 / 试题详细
  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 186

It was not until the teacher had explained it three times _______ how to work out the problem.

A.did he understand B.had he understood
C.that he understood D.that he didn’t understood
登录免费查看答案和解析

Itwasnotuntiltheteacherhadexpl