问题
选择题
I t doesn’t matter if _______ boys play basketball too much instead of watching TV.
A．sixteen-years-old
B．sixteen-year-olds
C．sixteen year old
D．sixteen-year-old
答案
答案：D
考查复合形容词。sixteen-year-old十六岁的，连字符之间的单词用单数，故选D。