问题
选择题
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
答案
答案：D
题目分析：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。
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