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    精英家教网 > 高中英语 > 题目详情
    In the past twelve months the research members ______ the effectiveness of many materials in a home building.
    A．had studiedB．would studyC．studiedD．have studied
    D
    考查时态。根据时间状语in the past twelve months在过去的12个月，用现在完成时，故选D。
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