| Experiments of this kind ________ in both the U. S. and Europe well before the Second World War. |
|
[ ]
|
A. have conducted
B. have been conducted
C. had conducted
D. had been conducted |
根据魔方格专家分析，试题“Experiments of this kind ________ in both the U. S. and Europe well before the Second World War.[ ]A. have conductedB. have been conductedC. had conductedD…”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。
与“Experiments of this kind ________ in both the U. S. and Europe well before the Second World War.[ ]A. have conductedB. have been conductedC. had conductedD”考查相似的试题有：
