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A
have conducted
B
have been conducted
C
had conducted
D
had been conducted
正确答案 :D
解析
本题考查句法——动词时态和语态。
句意:早在第二次世界大战之前,美国和欧洲就已经进行了这类实验。
D项:had been conducted过去完成时的被动语态。well before the Second World War意为“早在第二次世界大战之前”,说明“实验进行”发生在“过去的过去”,即过去完成时,结构为“had + 动词的过去分词”。Experiments of this kind (这类实验)与 conduct(实施)之间是动宾关系,根据句意可知,应用被动语态。所以此处应用过去完成时的被动语态,结构为“had been + 动词的过去分词”。符合题意,故选D。
A项:have conducted 现在完成时。不符合题意,故排除。
B项:have been conducted 现在完成时的被动语态。不符合题意,故排除。
C项:had conducted 过去完成时。不符合题意,故排除。
故本题答案为D。
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