Experiments of this kind(  )in both the

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问题 Experiments of this kind(  )in both the U.S and Europe well before the WWII.A.have been conductedB.have conductedC.had conductedD.had been conducted

选项 A.have been conducted
B.have conducted
C.had conducted
D.had been conducted

答案 D

解析 观察题干发现主语Experiments和谓语动词conduct之间是被动语态,选项BC排除。句子中出现的时间状语是“第二次世界大战”,所以谓语动词应当使用过去的时态。故正确选项为D。
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