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    精英家教网 > 高中英语 > 题目详情
    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

    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。
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