2 . In the past twelve months the research members ______ the effectiveness of many materials in a h

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
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
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