问题标题：
1.MymothersaidthatIcouldsing（）oneyearoid填介词2.IbeganlearningEnglishwhenIwastenyearsoldIstaredtolearnEnglish()()()()ten同义句3.LearningEnglishwellisn'teasy()isn'teasy()()Englishwell同义句4.Ican'tfinishthe
问题描述：
1.MymothersaidthatIcouldsing（）oneyearoid填介词
2.IbeganlearningEnglishwhenIwastenyearsold
IstaredtolearnEnglish()()()()ten同义句
3.LearningEnglishwellisn'teasy
()isn'teasy()()Englishwell同义句
4.Ican'tfinishtheworkinthreedays
Itis()()()tofinishtheworkinthreedays同义句
杜云梅回答：
1at
2attheageof
3.Ittolearn
4.impossibleforme
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