My grandfather is in his -------(sixty),but he still studies English in his free time.
问题描述：
My grandfather is in his -------(sixty),but he still studies English in his free time.
答
sixties
in one's +数字的复数 表示在某人多少岁的时候 in his sixties= sixty years old
答
对，就是这样
答
sixties
in one's +数字的复数 表示在某人多少岁的时候 in his sixties= sixty years old
答
sixties,in one's +整十数的复数形式，要熟记