The little girl can sing very well___________four.(在...年岁的时候)是at the age
问题描述：
The little girl can sing very well___________four.(在...年岁的时候)
是at the age
答
你好:at
答
是 表示在四岁时
也可用when she was four
答
The little girl can sing very well____at the age of_______four.
答
when she is ?