Samsome knowledge of the computer just by watching others working on it.A. brought up　　　B.

问题补充：

Samsome knowledge of the computer just by watching others working on it.

A. brought up

B. looked up

C. picked up

D. set up

答案：

A. brought up

B. looked up

(答案→)C. picked up

D. set up

解析：考察动词短语辨析。A抚养，抚育；B查找；C捡起；用车接；无意中学会；接受信号；康复。恢复；染上…；D建立，成立，设立；句意：Sam通过观看别人使用电脑，无意中学会了一些电脑的知识。根据句意说明本句指的pick up表示无意中学会。故C正确。