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答案：
A
A having amasse
d修饰主语表示主动语态完成时态。
B、C and前句子不完整，缺少谓语成分
D、E 句子重心发生变化，drawing修饰主句主语Neuroscientists即表示状态同步进行。显然科学家不能在积累知识过程中同步且随时作结论。得出答案，句子重心在作出结论上，错。
故最优选项为A。 
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