Scientists study ________ human brains work to make computers.       (2012·四川，17)
A．when B．how
C．thatD．whether
B
解析　考查名詞性從句。句意為：科學(xué)家研究人類大腦是如何工作的以制造電腦。分析句子結(jié)構(gòu)可知study后接賓語(yǔ)從句，從句中缺少方式狀語(yǔ)，故選B項(xiàng)。
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