Ifthenewsafetysystem
- 习题库
- 关注:2.38W次
问题详情:
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
【回答】
【*】A
知识点:虚拟语气与情态动词
题型:选择题
- 文章版权属于文章作者所有,转载请注明 https://zhongwengu.com/exercises/3q3k64.html