our teacher has been teaching in this school for( ) a.two year and a half b.two and a half year c.two years and a half d.two and a half years

问题描述:

our teacher has been teaching in this school for( ) a.two year and a half b.two and a half year c.two years and a half d.two and a half years

选D
two and a half years
代表2年半,要用复数