问题
选择题
.I have a __________sister.
A.9-years-old B.9 years old C.9-year-old
答案
答案：C
题目分析: 句意：我有一个九岁的妹妹。.9-years-old无此说法；9 years old九岁；9-year-old
9-year-old九岁的，形容词。根据a一个，和sister妹妹，可知为形容词，故选C.
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