_ should be allowed to do some sports after school in the afternoon.A.Sixteen-years-oldB.Sixteen-year-oldsC.Sixteen-year-old

问题描述:

_ should be allowed to do some sports after school in the afternoon.
A.Sixteen-years-old
B.Sixteen-year-olds
C.Sixteen-year-old

B
A的表达形式是错的;C是形容词,做前置定语。

b