当前位置: > 2 . In the past twelve months the research members ______ the effectiveness of many materials in a h...
题目
2 . In the past twelve months the research members ______ the effectiveness of many materials in a home building .
A . had studied B . would study C . studied D . have studied
请说明一下,谢

提问时间:2021-01-21

答案
D
因为是in the past twelve months
而且学习这个动作已经完成了
所以用过去完成时
举一反三
我想写一篇关于奥巴马的演讲的文章,写哪一篇好呢?为什么好
奥巴马演讲不用看稿子.为什么中国领导演讲要看?
想找英语初三上学期的首字母填空练习……
英语翻译
1,人们染上烟瘾,最终因吸烟使自己丧命.
版权所有 CopyRight © 2012-2019 超级试练试题库 All Rights Reserved.