D
因?yàn)槭莍n the past twelve months
而且學(xué)習(xí)這個(gè)動作已經(jīng)完成了
所以用過去完成時(shí)
2 . In the past twelve months the research members ______ the effectiveness of many materials in a home building .
2 . 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
請說明一下,謝
A . had studiedB . would studyC . studiedD . have studied
請說明一下,謝
其他人氣:126 ℃時(shí)間:2020-03-28 14:35:41
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