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2.Inthepasttwelvemonthstheresearchmembers______theeffectivenessofmanymaterialsinahomebuilding.A.hadstudiedB.wouldstudyC.studiedD.havestudied请说明一下，谢
题目内容：
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，谢优质解答
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
A . had studied B . would study C . studied D . have studied
请说明一下，谢
优质解答
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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