问题描述：
The little boy didn' t know______. A which hat is
The little boy didn' t know______.
A which hat is his. B which hat his is
C which hat was his. D which hat his was
The little boy didn' t know______.
A which hat is his. B which hat his is
C which hat was his. D which hat his was
问题解答：
我来补答展开全文阅读