题目内容

.I have a __________sister.
A.9-years-old    B.9 years old    C.9-year-old
C

试题分析: 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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