优题课 - 聚名师,上好课(www.youtike.com)
  首页 / 试题 / 初中英语 / 试题详细
  • 科目:英语
  • 题型:单选题
  • 难度:较易
  • 人气:915

To live on Mars, you need to wear boots which ________ to prevent you from floating off  into space.

A.design B.designed
C.are designing D.are designed
登录免费查看答案和解析

ToliveonMars,youneedtowearboot