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【题目】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

【答案】D

【解析】句意:第二次世界大战之前,在美国和欧洲就曾彻底地进行过这种实验。experimentsconduct之间为被动关系,故排除AC两项;conduct这一动作发生在第二次世界大战之前,即过去的过去,所以用过去完成时,故选择D项。

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