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:较难
  • 人气:1991

Do you know how much time and effort they devoted________ such a complicated project?  

A.to complete B.completed C.completing D.to completing
登录并查看解析

Do you know how much time and