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Scientists study ________ human brains work to make computers.       (2012·四川,17)
A.when B.how
C.thatD.whether
B
解析 考查名词性从句。句意为:科学家研究人类大脑是如何工作的以制造电脑。分析句子结构可知study后接宾语从句,从句中缺少方式状语,故选B项。
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