问题标题：
Theboyissoyoungthathecan'tlookafterhimself.Wehaveworkedhere[since,as]Ileftschool.第一句变同义句两种；1,Theboyisn't---------lookafterhimself.2,Theboyis---------lookafterhimself.
问题描述：
Theboyissoyoungthathecan'tlookafterhimself.Wehaveworkedhere[since,as]Ileftschool.
第一句变同义句两种；1,Theboyisn't---------lookafterhimself.2,Theboyis---------lookafterhimself.
甘永成回答：
oldenoughto
tooyoungto
选since
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