“ ______ as often as you can,” our English teacher often tells us, “ you will make rapid progress.”A.PracticeB.To practiceC.Having practisedD.Practising
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D解析考查非谓语动词。句意“‘尽可能的多练习，’，我们英语老师常这样告诉我们，‘你们就会进步很快。’”两个逗号之间是插入语，去掉不影响句意，前后是两个分句，practising作主语。故选D。