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    Experiments of this kind        in China before the Cultural Revolution in China.

    A. have conducted
    B. have been conducted
    C. had conducted  
    D. had been conducted
    D
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    科目：高中英语 来源：浙江省模拟题 题型：单选题

    Experiments of this kind        in China before the Cultural Revolution in China.
    [     ]
    A. have conducted
    B. have been conducted
    C. had conducted  
    D. had been conducted

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