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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．have conductedB．have been conducted
    C．had conductedD．had been conducted
    D
    本题考查时态。根据句中时间状语before the Second World War可知用过去完成时，由于experiments与conduct为被动，故选D。
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