He some French while he was away on a business trip in Paris.
A. made out
B. picked up
C. gave up
D. took on
网友回答
A. made out
(答案→)B. picked up
C. gave up
D. took on
解析：考查动词短语辨析。A辨认出，理解；B捡起；用车接；无意中学会；接受信号；康复。恢复；染上…；C放弃；D雇佣，呈现，承担；句意：当他在巴黎出差的时候，他无意中学会了一些法语。巩固B正确。