Tolearntoswimwell,___________.
A.one needs much practiceB.much practice is neededC.much practice needsD.one is needed much practice在线课程A
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。