Experiment of this kind _____ in both the U.S. and Europe well before the Second World War.
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A. have conducted
B. have been conducted
C. had conducted
D. had been conducted
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根据魔方格专家分析,试题“Experiment of this kind _____ in both the U.S. and Europe well before the Second World War. [ ]A. have conducted B. have been conductedC. had conducted D.…”主要考查了你对 【过去完成时的被动语态】 等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。
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