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【题目】To keep healthy, Professor Johnson ______ cycling as a regular form of exercise after he retired.

A. carried out B. caught on C. took up D. made for

【答案】C

【解析】

试题分析:考查动词短语。在退休后,为保持健康,约翰逊教授开始把骑自行车作为一项固定的锻炼方式carry out开展; catch on变得流行; take up开始从事; make for导致,有助于。故选C。

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