Experiments of this kind ___in both the U．S and Europe well before the Second World War．
A．had conducted
B．have conducted
C．have been conducted
D． had been conducted
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◎ 知识点
根据n多题专家分析，试题“Experiments of this kind ___in both the U．S and Europe well before the Second World War．A．had conductedB．have conductedC．have been conductedD． had been conducted…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 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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