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    Experiments of this kind ___in both the U．S and Europe well before the Second World War

    A．had conductedB．have conducted
    C．have been conductedD． had been conducted

    D

    解析试题分析：句意：在二次世界大战之前这种实验在欧洲和美国进行得很好。the Second World War发生在过去，又因为before在…….之前，所以表示的是过去的过去，Experiments of this kind与conduct是被动关系，故用被动语态。根据句意故选D。
    考点：考查动词时态的用法。

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