To learn to swim well, .
A. one needs much practice
B. much practice is needed
C. much practice needs
D. one is needed much practice
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(答案→)A. one needs much practice
B. much practice is needed
C. much practice needs
D. one is needed much practice
解析：本题考查非谓语动词。非谓语（不定式）作状语时，其逻辑主语一般应与句子主语一致。不定式to learn的逻辑主语应该是人。D项被动用法错误。