问题
选择题
Sun Tiantian , _______ , is a professional tennis player from Zhengzhou.
A．a eighteen years old girl
B．an eighteen-year-old girl
C．an eighteen years old girl
D．a eighteen-year-old girl
答案
答案：B
本题需要的是第一个元音音标为an，而eighteen-year-old作为定语，故选答案为B