Ithe hobby of fishing as a child.A. built upB. set upC. kept upD. took up

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A. built up
B. set up
C. kept up
(答案→)D. took up
解析：选D。本题主要考查短语动词意义的区别。built up 意为“树立，逐步建立”；set up意为“树立(榜样)；创立；建立”；kept up 意为“坚持；继续；使不低落”； took up 意为“拿起；吸收；从事”。