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：高中英語(yǔ) 來源：浙江省模擬題 題型：單選題

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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