Experiments of this kind____in both the U.S.and Europe well

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Experiments of this kind____in both the U.S.and Europe well before the World War.
A.have conducted B.have been conducted
C.had conducted D.had been conducted

Experiments of this kind____in both the U.S.and Europe well before the World War.
A.have conducted B.have been conducted
C.had conducted D.had been conducted
句子大意：在世界大战之前这种实验已经在美国和欧洲两地进行的很好了.
通过时间状语“before the World War”可判断是过去的时间,所以可排除AB!
再有就是Experiments与conduct之间是被动关系,所以选D是对的!

Experiments of this kind____in both the U.S.and Europe well Experiments of this kind had in both the U.S.and Europe well 英语翻译The well studied languages of Europe and Southeast Asia. Both of them ---- the sports meeting and did very well 12.Many experiments(?) us of the truth of this statement. the idea of this both pleased and frightened him 英语翻译Until the crisis of 2008,Europe’s gap between north and 2011年北京卷高考题几道单选题求解析!谢谢、21．Experiments of this kind in both. you handled both the study and the work very well. 英语选择 some of the experiments ()in this book are ea Many of the experiments described in this book are (ease) to Wish u all the best and take care of yourself .l well be hap