Question

My friend Vivian is an       girl.

A．seventeen- year- old	B．seventeen years old
C．eighteen –year –old	D．eighteen years old

Answer 1

C

C 考查数词加名词作定语。a/ an+数词-year-old +名词，表示“一个……岁的人”。“一个18岁的女孩”an eighteen–year–old girl，eighteen首字母发音是元音，故用冠词an。