John knowledge of radio just by staying around the radio station. A. caught on B. worked up C. took up D. picked up 题目和参考答案——青夏教育精英家教网—

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John _____ knowledge of radio just by staying around the radio station.

A. caught on B. worked up C. took up D. picked up

解析:

picked up偶尔学到，习得。

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