题目内容

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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