My sister is eight years old（改为同义句）My sister is _____ ______ girl
问题描述：
My sister is eight years old（改为同义句）
My sister is _____ ______ girl
答
an eight-year-old
答
a ten-year-old
答
My sister is eight years old.=
My sister is 【an eight-year-old】 girl.
答
a ten-years-old