问题标题:
【LucyandLilycouldswimwhentheywerefiveyearsold.改为否定句】
问题描述:

LucyandLilycouldswimwhentheywerefiveyearsold.改为否定句

彭少贤回答:
  LucyandLilycouldnotswimwhentheywerefiveyearsold..
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