作业帮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
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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
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
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
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
C studied
d
在过去的多少时间里，常用完成时。所以，选D。
转为第三人称We have three lessons in the morning.My favourite lesson is art.At eleven oclock,we have a breakand I talk to my friends.They go to the playground and play football,but I dont like football!we have at dining hall ai half past twel
in the past造句
Memory in the past
in the past two
in the past翻译
：in the past century
in the past long
in the past few
Trapped in the past
in the past
用in the past造句
In the past 是什么时态
in the past.的同义词
in the past few years
in the past的用法
In the past people是什么意思
翻译：in the past 急
See you in the past