题目内容
【题目】If you keep on practicing , you will be a very good swimmer one day.
A. to swim B. swimming C. swim D. swum
【答案】B
【解析】
试题分析：句意：如果你一直练习游泳，有一天你会成为一个好的游泳者。短语practice doing sth.表示练习做某事。结合语境，故选B。
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