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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 conductedC．have been conductedD．had been conducted
    D
    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，且“实验”是被“进行”，故选D。
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