You can make yourself in English pretty well if you keep on speaking the language.A. unde

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A. understand
B. understanding
C. to understand
(答案→)D. understood
解析：句意：如果反复练习这个语言，你可以很好的用英语表达自己。这里是用make+宾语+宾语补足语，因为yourself和understand是被动关系，用过去分词做宾语补足语，所以选D。