题目内容
John _____ knowledge of radio just by staying around the radio station.
A. caught on B. worked up C. took up D. picked up
D
解析:
pick up学到,习得。

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题目内容
John _____ knowledge of radio just by staying around the radio station.
A. caught on B. worked up C. took up D. picked up
D
pick up学到,习得。