单选题 When decimal currency was introduced, one old man in the village said, "I don't think it will ______ round here. "

【正确答案】 C

【答案解析】catch on流行起来；理解，明白。catch up很快拾起；缠住；赶上。catch out发觉；抓住某人的错处。catch in落入；陷于。