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Sam ______ some knowledge of the computer just by watching others working on it.
A.brought upB.looked upC.picked upD.set up
C
考查短语辨析。bring up 培养,look up 查字典,pick up 捡起,接某人,偶然学到,set up建立。句意:Sam偶然学会了一些电脑知识仅仅看别人从事电脑工作。故选C。
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