Many questions have been raised on whether the experiments were conducted______.

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问题 Many questions have been raised on whether the experiments were conducted______.

选项 A、exclusively
B、properly
C、merely
D、potentially

答案 B

解析词汇：副词1．这是一道词汇题，选项均为副词。2．exclusively意为“唯一地、专有地”，与语义不符。3．原文意思是“实验被质疑是否顺利进行”，因此(B)为正确选项。

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