首页 / 高中英语 / 试题详细
  • 更新 2022-09-04
  • 科目 英语
  • 题型 选择题
  • 难度 中等
  • 浏览 62

If the new safety system _______ to use, the accident would never have happened.

A.

had been put

B.

were put

C.

should be put

D.

would be put

登录免费查看答案和解析

Ifthenewsafetysystemtouse,thea