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Sam _____ some knowledge of the computer just by watching others working on it. 

A.brought up B.put up C.set up D.picked up

D

解析试题分析:考查短语辨析。A抚养;张贴;C建立;D无意中学到。句意:Sam只是通过看别人怎么操作电脑,学到了一些电脑知识。故D正确。
考点:考查短语辨析

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