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Experiments of this kind ___in both the ...

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

 

D 【解析】 试题分析: 考查动词时态。根据before the Second World War可知此处是指过去的过去,应该用过去完成时;而experiment和conduct是被动关系,所以用过去完成时的被动形式,故答案选D。句意:二战前就在美国和欧洲进行过这种实验。 考点:考查动词时态。
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