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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
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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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